90697791 has 4 divisors (see below), whose sum is σ = 120930392. Its totient is φ = 60465192.

The previous prime is 90697777. The next prime is 90697807. The reversal of 90697791 is 19779609.

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

It is not a de Polignac number, because 90697791 - 2⁵ = 90697759 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 90697791.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (90697991) 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, 15116296 + ... + 15116301.

It is an arithmetic number, because the mean of its divisors is an integer number (30232598).

Almost surely, 2^90697791 is an apocalyptic number.

90697791 is a deficient number, since it is larger than the sum of its proper divisors (30232601).

90697791 is a wasteful number, since it uses less digits than its factorization.

90697791 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30232600.

The product of its (nonzero) digits is 214326, while the sum is 48.

The square root of 90697791 is about 9523.5387855566. The cubic root of 90697791 is about 449.2956734931.

The spelling of 90697791 in words is "ninety million, six hundred ninety-seven thousand, seven hundred ninety-one".