1312215525 has 48 divisors (see below), whose sum is σ = 2537486400. Its totient is φ = 663007680.

The previous prime is 1312215503. The next prime is 1312215581. The reversal of 1312215525 is 5255122131.

1312215525 is a `hidden beast` number, since 1 + 3 + 122 + 15 + 525 = 666.

It is not a de Polignac number, because 1312215525 - 2⁵ = 1312215493 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 38334 + ... + 63983.

It is an arithmetic number, because the mean of its divisors is an integer number (52864300).

Almost surely, 2^1312215525 is an apocalyptic number.

1312215525 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1312215525 is a deficient number, since it is larger than the sum of its proper divisors (1225270875).

1312215525 is a wasteful number, since it uses less digits than its factorization.

1312215525 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 102355 (or 102344 counting only the distinct ones).

The product of its digits is 3000, while the sum is 27.

The square root of 1312215525 is about 36224.5155247106. The cubic root of 1312215525 is about 1094.8006767987.

Adding to 1312215525 its reverse (5255122131), we get a palindrome (6567337656).

The spelling of 1312215525 in words is "one billion, three hundred twelve million, two hundred fifteen thousand, five hundred twenty-five".