64169091 has 20 divisors (see below), whose sum is σ = 109552432. Its totient is φ = 36667728.

The previous prime is 64169087. The next prime is 64169113. The reversal of 64169091 is 19096146.

64169091 is a `hidden beast` number, since 641 + 6 + 9 + 0 + 9 + 1 = 666.

It is not a de Polignac number, because 64169091 - 2² = 64169087 is a prime.

It is a super-4 number, since 4×64169091⁴ (a number of 32 digits) contains 4444 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (64169191) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 56020 + ... + 57153.

Almost surely, 2^64169091 is an apocalyptic number.

64169091 is a deficient number, since it is larger than the sum of its proper divisors (45383341).

64169091 is a wasteful number, since it uses less digits than its factorization.

64169091 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 113192 (or 113183 counting only the distinct ones).

The product of its (nonzero) digits is 11664, while the sum is 36.

The square root of 64169091 is about 8010.5612162944. The cubic root of 64169091 is about 400.3519631307.

The spelling of 64169091 in words is "sixty-four million, one hundred sixty-nine thousand, ninety-one".