1155497831 has 8 divisors (see below), whose sum is σ = 1182978000. Its totient is φ = 1128280960.

The previous prime is 1155497821. The next prime is 1155497887. The reversal of 1155497831 is 1387945511.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1155497831 - 2⁶ = 1155497767 is a prime.

It is a super-2 number, since 2×1155497831² = 2670350474891409122, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1155497821) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 56930 + ... + 74511.

It is an arithmetic number, because the mean of its divisors is an integer number (147872250).

Almost surely, 2^1155497831 is an apocalyptic number.

1155497831 is a deficient number, since it is larger than the sum of its proper divisors (27480169).

1155497831 is a wasteful number, since it uses less digits than its factorization.

1155497831 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 131649.

The product of its digits is 151200, while the sum is 44.

The square root of 1155497831 is about 33992.6143595929. The cubic root of 1155497831 is about 1049.3564706748.

The spelling of 1155497831 in words is "one billion, one hundred fifty-five million, four hundred ninety-seven thousand, eight hundred thirty-one".