647400631 has 2 divisors, whose sum is σ = 647400632. Its totient is φ = 647400630.

The previous prime is 647400529. The next prime is 647400653. The reversal of 647400631 is 136004746.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 647400631 - 2⁹ = 647400119 is a prime.

It is a super-2 number, since 2×647400631² = 838255154038396322, which contains 22 as substring.

It is equal to p_33665260 and since 647400631 and 33665260 have the same sum of digits, it is a Honaker prime.

It is a junction number, because it is equal to n+sod(n) for n = 647400593 and 647400602.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (647400731) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 323700315 + 323700316.

It is an arithmetic number, because the mean of its divisors is an integer number (323700316).

Almost surely, 2^647400631 is an apocalyptic number.

647400631 is a deficient number, since it is larger than the sum of its proper divisors (1).

647400631 is an equidigital number, since it uses as much as digits as its factorization.

647400631 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 12096, while the sum is 31.

The square root of 647400631 is about 25444.0686801463. The cubic root of 647400631 is about 865.0828575111.

The spelling of 647400631 in words is "six hundred forty-seven million, four hundred thousand, six hundred thirty-one".