631236145 has 16 divisors (see below), whose sum is σ = 809259840. Its totient is φ = 471265344.

The previous prime is 631236139. The next prime is 631236157. The reversal of 631236145 is 541632136.

It is a cyclic number.

It is not a de Polignac number, because 631236145 - 2¹³ = 631227953 is a prime.

It is a super-2 number, since 2×631236145² = 796918141508922050, which contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 43222 + ... + 55951.

It is an arithmetic number, because the mean of its divisors is an integer number (50578740).

Almost surely, 2^631236145 is an apocalyptic number.

It is an amenable number.

631236145 is a deficient number, since it is larger than the sum of its proper divisors (178023695).

631236145 is a wasteful number, since it uses less digits than its factorization.

631236145 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 99264.

The product of its digits is 12960, while the sum is 31.

The square root of 631236145 is about 25124.4133264839. The cubic root of 631236145 is about 857.8222097445.

The spelling of 631236145 in words is "six hundred thirty-one million, two hundred thirty-six thousand, one hundred forty-five".