139630649 has 2 divisors, whose sum is σ = 139630650. Its totient is φ = 139630648.

The previous prime is 139630633. The next prime is 139630657. The reversal of 139630649 is 946036931.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 137475625 + 2155024 = 11725^2 + 1468^2 .

It is a cyclic number.

It is not a de Polignac number, because 139630649 - 2⁴ = 139630633 is a prime.

It is a super-2 number, since 2×139630649² = 38993436280322402, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (139630349) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69815324 + 69815325.

It is an arithmetic number, because the mean of its divisors is an integer number (69815325).

Almost surely, 2^139630649 is an apocalyptic number.

It is an amenable number.

139630649 is a deficient number, since it is larger than the sum of its proper divisors (1).

139630649 is an equidigital number, since it uses as much as digits as its factorization.

139630649 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 104976, while the sum is 41.

The square root of 139630649 is about 11816.5413298477. The cubic root of 139630649 is about 518.7923763901.

The spelling of 139630649 in words is "one hundred thirty-nine million, six hundred thirty thousand, six hundred forty-nine".