631752157 has 2 divisors, whose sum is σ = 631752158. Its totient is φ = 631752156.

The previous prime is 631752127. The next prime is 631752161. The reversal of 631752157 is 751257136.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 580858201 + 50893956 = 24101^2 + 7134^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-631752157 is a prime.

It is a super-2 number, since 2×631752157² = 798221575748305298, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (631752127) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 315876078 + 315876079.

It is an arithmetic number, because the mean of its divisors is an integer number (315876079).

Almost surely, 2^631752157 is an apocalyptic number.

It is an amenable number.

631752157 is a deficient number, since it is larger than the sum of its proper divisors (1).

631752157 is an equidigital number, since it uses as much as digits as its factorization.

631752157 is an evil number, because the sum of its binary digits is even.

The product of its digits is 44100, while the sum is 37.

The square root of 631752157 is about 25134.6803639911. The cubic root of 631752157 is about 858.0558919656.

The spelling of 631752157 in words is "six hundred thirty-one million, seven hundred fifty-two thousand, one hundred fifty-seven".