706621631 has 2 divisors, whose sum is σ = 706621632. Its totient is φ = 706621630.

The previous prime is 706621549. The next prime is 706621637. The reversal of 706621631 is 136126607.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 706621631 - 2²⁶ = 639512767 is a prime.

It is a super-2 number, since 2×706621631² = 998628258794200322, which contains 22 as substring.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (706621637) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 353310815 + 353310816.

It is an arithmetic number, because the mean of its divisors is an integer number (353310816).

Almost surely, 2^706621631 is an apocalyptic number.

706621631 is a deficient number, since it is larger than the sum of its proper divisors (1).

706621631 is an equidigital number, since it uses as much as digits as its factorization.

706621631 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 9072, while the sum is 32.

The square root of 706621631 is about 26582.3556330134. The cubic root of 706621631 is about 890.6949212137.

The spelling of 706621631 in words is "seven hundred six million, six hundred twenty-one thousand, six hundred thirty-one".