631345 has 16 divisors (see below), whose sum is σ = 891072. Its totient is φ = 423360.

The previous prime is 631339. The next prime is 631357. The reversal of 631345 is 543136.

631345 = T₁₀₄ + T₁₀₅ + ... + T₁₆₉.

It is not a de Polignac number, because 631345 - 2¹⁹ = 107057 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 274 + ... + 1156.

It is an arithmetic number, because the mean of its divisors is an integer number (55692).

2⁶³¹³⁴⁵ is an apocalyptic number.

631345 is a gapful number since it is divisible by the number (65) formed by its first and last digit.

It is an amenable number.

631345 is a deficient number, since it is larger than the sum of its proper divisors (259727).

631345 is a wasteful number, since it uses less digits than its factorization.

631345 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 912.

The product of its digits is 1080, while the sum is 22.

The square root of 631345 is about 794.5722119480. The cubic root of 631345 is about 85.7871516632.

Subtracting from 631345 its reverse (543136), we obtain a square (88209 = 297²).

The spelling of 631345 in words is "six hundred thirty-one thousand, three hundred forty-five".