631505225 has 12 divisors (see below), whose sum is σ = 843302796. Its totient is φ = 466342080.

The previous prime is 631505221. The next prime is 631505279. The reversal of 631505225 is 522505136.

It is a happy number.

It can be written as a sum of positive squares in 6 ways, for example, as 29637136 + 601868089 = 5444^2 + 24533^2 .

It is not a de Polignac number, because 631505225 - 2² = 631505221 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (631505221) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 971222 + ... + 971871.

It is an arithmetic number, because the mean of its divisors is an integer number (70275233).

Almost surely, 2^631505225 is an apocalyptic number.

631505225 is a gapful number since it is divisible by the number (65) formed by its first and last digit.

It is an amenable number.

631505225 is a deficient number, since it is larger than the sum of its proper divisors (211797571).

631505225 is a wasteful number, since it uses less digits than its factorization.

631505225 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1943116 (or 1943111 counting only the distinct ones).

The product of its (nonzero) digits is 9000, while the sum is 29.

The square root of 631505225 is about 25129.7677068452. The cubic root of 631505225 is about 857.9440817316.

The spelling of 631505225 in words is "six hundred thirty-one million, five hundred five thousand, two hundred twenty-five".