631938145 has 4 divisors (see below), whose sum is σ = 758325780. Its totient is φ = 505550512.

The previous prime is 631938107. The next prime is 631938211. The reversal of 631938145 is 541839136.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 416200801 + 215737344 = 20401^2 + 14688^2 .

It is a cyclic number.

It is not a de Polignac number, because 631938145 - 2⁷ = 631938017 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 631938098 and 631938107.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 63193810 + ... + 63193819.

It is an arithmetic number, because the mean of its divisors is an integer number (189581445).

Almost surely, 2^631938145 is an apocalyptic number.

It is an amenable number.

631938145 is a deficient number, since it is larger than the sum of its proper divisors (126387635).

631938145 is a wasteful number, since it uses less digits than its factorization.

631938145 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 126387634.

The product of its digits is 77760, while the sum is 40.

The square root of 631938145 is about 25138.3799199551. The cubic root of 631938145 is about 858.1400876633.

Subtracting from 631938145 its reverse (541839136), we obtain a palindrome (90099009).

The spelling of 631938145 in words is "six hundred thirty-one million, nine hundred thirty-eight thousand, one hundred forty-five".