1531312156 has 24 divisors (see below), whose sum is σ = 2925918576. Its totient is φ = 695454720.

The previous prime is 1531312121. The next prime is 1531312169. The reversal of 1531312156 is 6512131351.

It is a super-2 number, since 2×1531312156² = 4689833838226736672, which contains 22 as substring.

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, 39250 + ... + 67846.

It is an arithmetic number, because the mean of its divisors is an integer number (121913274).

Almost surely, 2^1531312156 is an apocalyptic number.

It is an amenable number.

1531312156 is a deficient number, since it is larger than the sum of its proper divisors (1394606420).

1531312156 is a wasteful number, since it uses less digits than its factorization.

1531312156 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29829 (or 29827 counting only the distinct ones).

The product of its digits is 2700, while the sum is 28.

The square root of 1531312156 is about 39131.9837984225. The cubic root of 1531312156 is about 1152.6246682473.

The spelling of 1531312156 in words is "one billion, five hundred thirty-one million, three hundred twelve thousand, one hundred fifty-six".