101543551 has 4 divisors (see below), whose sum is σ = 105958512. Its totient is φ = 97128592.

The previous prime is 101543537. The next prime is 101543591. The reversal of 101543551 is 155345101.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-101543551 is a prime.

It is a super-2 number, since 2×101543551² = 20622185499379202, 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 (101543591) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2207446 + ... + 2207491.

It is an arithmetic number, because the mean of its divisors is an integer number (26489628).

Almost surely, 2^101543551 is an apocalyptic number.

101543551 is a deficient number, since it is larger than the sum of its proper divisors (4414961).

101543551 is an equidigital number, since it uses as much as digits as its factorization.

101543551 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4414960.

The product of its (nonzero) digits is 1500, while the sum is 25.

The square root of 101543551 is about 10076.8820078435. The cubic root of 101543551 is about 466.5348764471.

Adding to 101543551 its reverse (155345101), we get a palindrome (256888652).

The spelling of 101543551 in words is "one hundred one million, five hundred forty-three thousand, five hundred fifty-one".