631531145 has 8 divisors (see below), whose sum is σ = 866099904. Its totient is φ = 433049904.

The previous prime is 631531141. The next prime is 631531183. The reversal of 631531145 is 541135136.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 631531145 - 2² = 631531141 is a prime.

It is a super-2 number, since 2×631531145² = 797663174210022050, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (631531141) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9021839 + ... + 9021908.

It is an arithmetic number, because the mean of its divisors is an integer number (108262488).

Almost surely, 2^631531145 is an apocalyptic number.

It is an amenable number.

631531145 is a deficient number, since it is larger than the sum of its proper divisors (234568759).

631531145 is a wasteful number, since it uses less digits than its factorization.

631531145 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18043759.

The product of its digits is 5400, while the sum is 29.

The square root of 631531145 is about 25130.2834245856. The cubic root of 631531145 is about 857.9558196162.

The spelling of 631531145 in words is "six hundred thirty-one million, five hundred thirty-one thousand, one hundred forty-five".