64169939 has 2 divisors, whose sum is σ = 64169940. Its totient is φ = 64169938.

The previous prime is 64169923. The next prime is 64169981. The reversal of 64169939 is 93996146.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 64169939 - 2⁴ = 64169923 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 64169893 and 64169902.

It is not a weakly prime, because it can be changed into another prime (64109939) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32084969 + 32084970.

It is an arithmetic number, because the mean of its divisors is an integer number (32084970).

Almost surely, 2^64169939 is an apocalyptic number.

64169939 is a deficient number, since it is larger than the sum of its proper divisors (1).

64169939 is an equidigital number, since it uses as much as digits as its factorization.

64169939 is an evil number, because the sum of its binary digits is even.

The product of its digits is 314928, while the sum is 47.

The square root of 64169939 is about 8010.6141462437. The cubic root of 64169939 is about 400.3537266847.

The spelling of 64169939 in words is "sixty-four million, one hundred sixty-nine thousand, nine hundred thirty-nine".