1231502225 has 24 divisors (see below), whose sum is σ = 1627395840. Its totient is φ = 922296320.

The previous prime is 1231502183. The next prime is 1231502227. The reversal of 1231502225 is 5222051321.

It is not a de Polignac number, because 1231502225 - 2²⁴ = 1214725009 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (23).

It is a self number, because there is not a number n which added to its sum of digits gives 1231502225.

It is not an unprimeable number, because it can be changed into a prime (1231502227) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 4241 + ... + 49809.

It is an arithmetic number, because the mean of its divisors is an integer number (67808160).

Almost surely, 2^1231502225 is an apocalyptic number.

It is an amenable number.

1231502225 is a deficient number, since it is larger than the sum of its proper divisors (395893615).

1231502225 is a wasteful number, since it uses less digits than its factorization.

1231502225 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45649 (or 45644 counting only the distinct ones).

The product of its (nonzero) digits is 1200, while the sum is 23.

The square root of 1231502225 is about 35092.7659924378. The cubic root of 1231502225 is about 1071.8772835250.

Adding to 1231502225 its reverse (5222051321), we get a palindrome (6453553546).

The spelling of 1231502225 in words is "one billion, two hundred thirty-one million, five hundred two thousand, two hundred twenty-five".