90696991 has 12 divisors (see below), whose sum is σ = 115096680. Its totient is φ = 70672560.

The previous prime is 90696971. The next prime is 90697003. The reversal of 90696991 is 19969609.

It is a happy number.

It is not a de Polignac number, because 90696991 - 2¹⁹ = 90172703 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (49).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (90696901) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 83596 + ... + 84673.

It is an arithmetic number, because the mean of its divisors is an integer number (9591390).

Almost surely, 2^90696991 is an apocalyptic number.

90696991 is a deficient number, since it is larger than the sum of its proper divisors (24399689).

90696991 is a wasteful number, since it uses less digits than its factorization.

90696991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 168294 (or 168287 counting only the distinct ones).

The product of its (nonzero) digits is 236196, while the sum is 49.

The square root of 90696991 is about 9523.4967842699. The cubic root of 90696991 is about 449.2943524848.

The spelling of 90696991 in words is "ninety million, six hundred ninety-six thousand, nine hundred ninety-one".