64139149 has 2 divisors, whose sum is σ = 64139150. Its totient is φ = 64139148.

The previous prime is 64139087. The next prime is 64139177. The reversal of 64139149 is 94193146.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 56355049 + 7784100 = 7507^2 + 2790^2 .

It is a cyclic number.

It is not a de Polignac number, because 64139149 - 2¹⁹ = 63614861 is a prime.

It is a super-2 number, since 2×64139149² = 8227660868888402, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (64139749) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32069574 + 32069575.

It is an arithmetic number, because the mean of its divisors is an integer number (32069575).

Almost surely, 2^64139149 is an apocalyptic number.

It is an amenable number.

64139149 is a deficient number, since it is larger than the sum of its proper divisors (1).

64139149 is an equidigital number, since it uses as much as digits as its factorization.

64139149 is an evil number, because the sum of its binary digits is even.

The product of its digits is 23328, while the sum is 37.

The square root of 64139149 is about 8008.6920904727. The cubic root of 64139149 is about 400.2896839074.

The spelling of 64139149 in words is "sixty-four million, one hundred thirty-nine thousand, one hundred forty-nine".