1156149531 has 28 divisors (see below), whose sum is σ = 1761916000. Its totient is φ = 758101680.

The previous prime is 1156149509. The next prime is 1156149571. The reversal of 1156149531 is 1359416511.

1156149531 is a `hidden beast` number, since 1 + 1 + 5 + 614 + 9 + 5 + 31 = 666.

It is not a de Polignac number, because 1156149531 - 2¹¹ = 1156147483 is a prime.

It is a super-2 number, since 2×1156149531² = 2673363476063039922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1156149571) by changing a digit.

It is a polite number, since it can be written in 27 ways as a sum of consecutive naturals, for example, 31470 + ... + 57468.

Almost surely, 2^1156149531 is an apocalyptic number.

1156149531 is a deficient number, since it is larger than the sum of its proper divisors (605766469).

1156149531 is an frugal number, since it uses more digits than its factorization.

1156149531 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26078 (or 26063 counting only the distinct ones).

The product of its digits is 16200, while the sum is 36.

The square root of 1156149531 is about 34002.1989141879. The cubic root of 1156149531 is about 1049.5537123795.

The spelling of 1156149531 in words is "one billion, one hundred fifty-six million, one hundred forty-nine thousand, five hundred thirty-one".