631542239 has 2 divisors, whose sum is σ = 631542240. Its totient is φ = 631542238.

The previous prime is 631542179. The next prime is 631542271. The reversal of 631542239 is 932245136.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-631542239 is a prime.

It is a super-2 number, since 2×631542239² = 797691199282266242, which contains 22 as substring.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 631542199 and 631542208.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (631542139) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 315771119 + 315771120.

It is an arithmetic number, because the mean of its divisors is an integer number (315771120).

Almost surely, 2^631542239 is an apocalyptic number.

631542239 is a deficient number, since it is larger than the sum of its proper divisors (1).

631542239 is an equidigital number, since it uses as much as digits as its factorization.

631542239 is an evil number, because the sum of its binary digits is even.

The product of its digits is 38880, while the sum is 35.

The square root of 631542239 is about 25130.5041533193. The cubic root of 631542239 is about 857.9608434414.

The spelling of 631542239 in words is "six hundred thirty-one million, five hundred forty-two thousand, two hundred thirty-nine".