631346531 has 2 divisors, whose sum is σ = 631346532. Its totient is φ = 631346530.

The previous prime is 631346473. The next prime is 631346543. The reversal of 631346531 is 135643136.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 631346531 - 2⁶ = 631346467 is a prime.

It is a super-2 number, since 2×631346531² = 797196884411467922, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (631342531) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 315673265 + 315673266.

It is an arithmetic number, because the mean of its divisors is an integer number (315673266).

Almost surely, 2^631346531 is an apocalyptic number.

631346531 is a deficient number, since it is larger than the sum of its proper divisors (1).

631346531 is an equidigital number, since it uses as much as digits as its factorization.

631346531 is an evil number, because the sum of its binary digits is even.

The product of its digits is 19440, while the sum is 32.

The square root of 631346531 is about 25126.6100180665. The cubic root of 631346531 is about 857.8722100727.

Adding to 631346531 its reverse (135643136), we get a palindrome (766989667).

The spelling of 631346531 in words is "six hundred thirty-one million, three hundred forty-six thousand, five hundred thirty-one".