1231654625 has 8 divisors (see below), whose sum is σ = 1537105128. Its totient is φ = 985323600.

The previous prime is 1231654609. The next prime is 1231654661. The reversal of 1231654625 is 5264561321.

It can be written as a sum of positive squares in 4 ways, for example, as 349802209 + 881852416 = 18703^2 + 29696^2 .

It is not a de Polignac number, because 1231654625 - 2⁴ = 1231654609 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4926494 + ... + 4926743.

It is an arithmetic number, because the mean of its divisors is an integer number (192138141).

Almost surely, 2^1231654625 is an apocalyptic number.

It is an amenable number.

1231654625 is a deficient number, since it is larger than the sum of its proper divisors (305450503).

1231654625 is an frugal number, since it uses more digits than its factorization.

1231654625 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9853252 (or 9853242 counting only the distinct ones).

The product of its digits is 43200, while the sum is 35.

The square root of 1231654625 is about 35094.9373129516. The cubic root of 1231654625 is about 1071.9214971032.

The spelling of 1231654625 in words is "one billion, two hundred thirty-one million, six hundred fifty-four thousand, six hundred twenty-five".