90569797 has 4 divisors (see below), whose sum is σ = 90597760. Its totient is φ = 90541836.

The previous prime is 90569749. The next prime is 90569803. The reversal of 90569797 is 79796509.

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: 79796509 = 13 ⋅6138193.

It is a cyclic number.

It is not a de Polignac number, because 90569797 - 2²³ = 82181189 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (90569707) 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, 8373 + ... + 15850.

It is an arithmetic number, because the mean of its divisors is an integer number (22649440).

Almost surely, 2^90569797 is an apocalyptic number.

It is an amenable number.

90569797 is a deficient number, since it is larger than the sum of its proper divisors (27963).

90569797 is a wasteful number, since it uses less digits than its factorization.

90569797 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27962.

The product of its (nonzero) digits is 1071630, while the sum is 52.

The square root of 90569797 is about 9516.8165370569. The cubic root of 90569797 is about 449.0842232006.

The spelling of 90569797 in words is "ninety million, five hundred sixty-nine thousand, seven hundred ninety-seven".