631557049 has 2 divisors, whose sum is σ = 631557050. Its totient is φ = 631557048.

The previous prime is 631557011. The next prime is 631557103. The reversal of 631557049 is 940755136.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 555309225 + 76247824 = 23565^2 + 8732^2 .

It is a cyclic number.

It is not a de Polignac number, because 631557049 - 2⁷ = 631556921 is a prime.

It is a super-2 number, since 2×631557049² = 797728612283176802, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (631557649) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 315778524 + 315778525.

It is an arithmetic number, because the mean of its divisors is an integer number (315778525).

Almost surely, 2^631557049 is an apocalyptic number.

It is an amenable number.

631557049 is a deficient number, since it is larger than the sum of its proper divisors (1).

631557049 is an equidigital number, since it uses as much as digits as its factorization.

631557049 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 113400, while the sum is 40.

The square root of 631557049 is about 25130.7988134082. The cubic root of 631557049 is about 857.9675499343.

The spelling of 631557049 in words is "six hundred thirty-one million, five hundred fifty-seven thousand, forty-nine".