1231620625 has 20 divisors (see below), whose sum is σ = 1568113668. Its totient is φ = 966680000.

The previous prime is 1231620617. The next prime is 1231620631. The reversal of 1231620625 is 5260261321.

It can be written as a sum of positive squares in 10 ways, for example, as 930494016 + 301126609 = 30504^2 + 17353^2 .

It is not a de Polignac number, because 1231620625 - 2³ = 1231620617 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1231620593 and 1231620602.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 14535 + ... + 51715.

Almost surely, 2^1231620625 is an apocalyptic number.

It is an amenable number.

1231620625 is a deficient number, since it is larger than the sum of its proper divisors (336493043).

1231620625 is an frugal number, since it uses more digits than its factorization.

1231620625 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37254 (or 37239 counting only the distinct ones).

The product of its (nonzero) digits is 4320, while the sum is 28.

The square root of 1231620625 is about 35094.4529092562. The cubic root of 1231620625 is about 1071.9116334977.

Adding to 1231620625 its reverse (5260261321), we get a palindrome (6491881946).

The spelling of 1231620625 in words is "one billion, two hundred thirty-one million, six hundred twenty thousand, six hundred twenty-five".