631145 has 4 divisors (see below), whose sum is σ = 757380. Its totient is φ = 504912.

The previous prime is 631139. The next prime is 631151. The reversal of 631145 is 541136.

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

It is an interprime number because it is at equal distance from previous prime (631139) and next prime (631151).

It can be written as a sum of positive squares in 2 ways, for example, as 153664 + 477481 = 392^2 + 691^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-631145 is a prime.

It is a super-2 number, since 2×631145² = 796688022050, which contains 22 as substring.

It is a Curzon number.

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, 63110 + ... + 63119.

It is an arithmetic number, because the mean of its divisors is an integer number (189345).

2⁶³¹¹⁴⁵ is an apocalyptic number.

It is an amenable number.

631145 is a deficient number, since it is larger than the sum of its proper divisors (126235).

631145 is a wasteful number, since it uses less digits than its factorization.

631145 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 126234.

The product of its digits is 360, while the sum is 20.

The square root of 631145 is about 794.4463480941. The cubic root of 631145 is about 85.7780920406.

Subtracting from 631145 its reverse (541136), we obtain a palindrome (90009).

The spelling of 631145 in words is "six hundred thirty-one thousand, one hundred forty-five".