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99742609 = 195249611
BaseRepresentation
bin1011111000111…
…11001110010001
320221200110010201
411330133032101
5201013230414
613521455201
72320540531
oct574371621
9227613121
1099742609
115133610a
12294a1501
13178835c5
14d3654c1
158b53574
hex5f1f391

99742609 has 4 divisors (see below), whose sum is σ = 104992240. Its totient is φ = 94492980.

The previous prime is 99742541. The next prime is 99742613. The reversal of 99742609 is 90624799.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 90624799 = 199455401.

It is a cyclic number.

It is not a de Polignac number, because 99742609 - 223 = 91354001 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (99742619) 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, 2624787 + ... + 2624824.

It is an arithmetic number, because the mean of its divisors is an integer number (26248060).

Almost surely, 299742609 is an apocalyptic number.

It is an amenable number.

99742609 is a deficient number, since it is larger than the sum of its proper divisors (5249631).

99742609 is a wasteful number, since it uses less digits than its factorization.

99742609 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5249630.

The product of its (nonzero) digits is 244944, while the sum is 46.

The square root of 99742609 is about 9987.1221580593. The cubic root of 99742609 is about 463.7603068015.

The spelling of 99742609 in words is "ninety-nine million, seven hundred forty-two thousand, six hundred nine".

Divisors: 1 19 5249611 99742609