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106542191 = 715220313
BaseRepresentation
bin1100101100110…
…11010001101111
321102110220102002
412112123101233
5204233322231
614323322515
72432410430
oct626332157
9242426362
10106542191
115515a7a8
122b82043b
13190c4522
1410215487
1595480cb
hex659b46f

106542191 has 4 divisors (see below), whose sum is σ = 121762512. Its totient is φ = 91321872.

The previous prime is 106542157. The next prime is 106542193. The reversal of 106542191 is 191245601.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 191245601 = 571334931.

It is a cyclic number.

It is not a de Polignac number, because 106542191 - 214 = 106525807 is a prime.

It is a super-2 number, since 2×1065421912 = 22702476926160962, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (106542193) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7610150 + ... + 7610163.

It is an arithmetic number, because the mean of its divisors is an integer number (30440628).

Almost surely, 2106542191 is an apocalyptic number.

106542191 is a deficient number, since it is larger than the sum of its proper divisors (15220321).

106542191 is an equidigital number, since it uses as much as digits as its factorization.

106542191 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15220320.

The product of its (nonzero) digits is 2160, while the sum is 29.

The square root of 106542191 is about 10321.9276784911. The cubic root of 106542191 is about 474.0678910155.

Adding to 106542191 its reverse (191245601), we get a palindrome (297787792).

The spelling of 106542191 in words is "one hundred six million, five hundred forty-two thousand, one hundred ninety-one".

Divisors: 1 7 15220313 106542191