64139071 has 2 divisors, whose sum is σ = 64139072. Its totient is φ = 64139070.

The previous prime is 64139069. The next prime is 64139083. The reversal of 64139071 is 17093146.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 64139071 - 2¹ = 64139069 is a prime.

It is a super-2 number, since 2×64139071² = 8227640857486082, which contains 22 as substring.

Together with 64139069, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (64139371) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32069535 + 32069536.

It is an arithmetic number, because the mean of its divisors is an integer number (32069536).

Almost surely, 2^64139071 is an apocalyptic number.

64139071 is a deficient number, since it is larger than the sum of its proper divisors (1).

64139071 is an equidigital number, since it uses as much as digits as its factorization.

64139071 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4536, while the sum is 31.

The square root of 64139071 is about 8008.6872207622. The cubic root of 64139071 is about 400.2895216425.

The spelling of 64139071 in words is "sixty-four million, one hundred thirty-nine thousand, seventy-one".