1531312116 has 24 divisors (see below), whose sum is σ = 3660210624. Its totient is φ = 497987520.

The previous prime is 1531312109. The next prime is 1531312121. The reversal of 1531312116 is 6112131351.

It is a congruent 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, 1555720 + ... + 1556703.

It is an arithmetic number, because the mean of its divisors is an integer number (152508776).

Almost surely, 2^1531312116 is an apocalyptic number.

It is an amenable number.

1531312116 is an abundant number, since it is smaller than the sum of its proper divisors (2128898508).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1531312116 is a wasteful number, since it uses less digits than its factorization.

1531312116 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3112471 (or 3112469 counting only the distinct ones).

The product of its digits is 540, while the sum is 24.

The square root of 1531312116 is about 39131.9832873316. The cubic root of 1531312116 is about 1152.6246582113.

Adding to 1531312116 its reverse (6112131351), we get a palindrome (7643443467).

The spelling of 1531312116 in words is "one billion, five hundred thirty-one million, three hundred twelve thousand, one hundred sixteen".