90651569 has 4 divisors (see below), whose sum is σ = 90898944. Its totient is φ = 90404196.

The previous prime is 90651541. The next prime is 90651623. The reversal of 90651569 is 96515609.

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: 96515609 = 239 ⋅403831.

It is a cyclic number.

It is not a de Polignac number, because 90651569 - 2¹⁶ = 90586033 is a prime.

It is a super-2 number, since 2×90651569² = 16435413924323522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (90651529) 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, 123137 + ... + 123870.

It is an arithmetic number, because the mean of its divisors is an integer number (22724736).

Almost surely, 2^90651569 is an apocalyptic number.

It is an amenable number.

90651569 is a deficient number, since it is larger than the sum of its proper divisors (247375).

90651569 is a wasteful number, since it uses less digits than its factorization.

90651569 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 247374.

The product of its (nonzero) digits is 72900, while the sum is 41.

The square root of 90651569 is about 9521.1117523113. Note that the first 3 decimals coincide. The cubic root of 90651569 is about 449.2193361929.

The spelling of 90651569 in words is "ninety million, six hundred fifty-one thousand, five hundred sixty-nine".