1321313525 has 48 divisors (see below), whose sum is σ = 1988622720. Its totient is φ = 850176000.

The previous prime is 1321313471. The next prime is 1321313551. The reversal of 1321313525 is 5253131231.

It is not a de Polignac number, because 1321313525 - 2¹⁰ = 1321312501 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1321313494 and 1321313503.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 1787606 + ... + 1788344.

It is an arithmetic number, because the mean of its divisors is an integer number (41429640).

Almost surely, 2^1321313525 is an apocalyptic number.

It is an amenable number.

1321313525 is a deficient number, since it is larger than the sum of its proper divisors (667309195).

1321313525 is a wasteful number, since it uses less digits than its factorization.

1321313525 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1374 (or 1369 counting only the distinct ones).

The product of its digits is 2700, while the sum is 26.

The square root of 1321313525 is about 36349.8765472457. The cubic root of 1321313525 is about 1097.3250499891.

Adding to 1321313525 its reverse (5253131231), we get a palindrome (6574444756).

The spelling of 1321313525 in words is "one billion, three hundred twenty-one million, three hundred thirteen thousand, five hundred twenty-five".