90691539 has 4 divisors (see below), whose sum is σ = 120922056. Its totient is φ = 60461024.

The previous prime is 90691499. The next prime is 90691577. The reversal of 90691539 is 93519609.

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

It is a cyclic number.

It is not a de Polignac number, because 90691539 - 2⁸ = 90691283 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 90691539.

It is not an unprimeable number, because it can be changed into a prime (90691339) 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, 15115254 + ... + 15115259.

It is an arithmetic number, because the mean of its divisors is an integer number (30230514).

Almost surely, 2^90691539 is an apocalyptic number.

90691539 is a deficient number, since it is larger than the sum of its proper divisors (30230517).

90691539 is a wasteful number, since it uses less digits than its factorization.

90691539 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30230516.

The product of its (nonzero) digits is 65610, while the sum is 42.

The square root of 90691539 is about 9523.2105405688. The cubic root of 90691539 is about 449.2853496066.

The spelling of 90691539 in words is "ninety million, six hundred ninety-one thousand, five hundred thirty-nine".