64156969 has 2 divisors, whose sum is σ = 64156970. Its totient is φ = 64156968.

The previous prime is 64156957. The next prime is 64156973. The reversal of 64156969 is 96965146.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 57577744 + 6579225 = 7588^2 + 2565^2 .

It is a cyclic number.

It is not a de Polignac number, because 64156969 - 2¹¹ = 64154921 is a prime.

It is a super-2 number, since 2×64156969² = 8232233342533922, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (64156919) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32078484 + 32078485.

It is an arithmetic number, because the mean of its divisors is an integer number (32078485).

Almost surely, 2^64156969 is an apocalyptic number.

It is an amenable number.

64156969 is a deficient number, since it is larger than the sum of its proper divisors (1).

64156969 is an equidigital number, since it uses as much as digits as its factorization.

64156969 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 349920, while the sum is 46.

The square root of 64156969 is about 8009.8045544195. The cubic root of 64156969 is about 400.3267517605.

The spelling of 64156969 in words is "sixty-four million, one hundred fifty-six thousand, nine hundred sixty-nine".