647364139 has 2 divisors, whose sum is σ = 647364140. Its totient is φ = 647364138.

The previous prime is 647364127. The next prime is 647364163. The reversal of 647364139 is 931463746.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 647364139 - 2⁹ = 647363627 is a prime.

It is a super-2 number, since 2×647364139² = 838160656926422642, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 647364095 and 647364104.

It is not a weakly prime, because it can be changed into another prime (647364119) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 323682069 + 323682070.

It is an arithmetic number, because the mean of its divisors is an integer number (323682070).

Almost surely, 2^647364139 is an apocalyptic number.

647364139 is a deficient number, since it is larger than the sum of its proper divisors (1).

647364139 is an equidigital number, since it uses as much as digits as its factorization.

647364139 is an evil number, because the sum of its binary digits is even.

The product of its digits is 326592, while the sum is 43.

The square root of 647364139 is about 25443.3515677475. The cubic root of 647364139 is about 865.0666031779.

The spelling of 647364139 in words is "six hundred forty-seven million, three hundred sixty-four thousand, one hundred thirty-nine".