1156551998 has 12 divisors (see below), whose sum is σ = 2018065392. Its totient is φ = 495665100.

The previous prime is 1156551947. The next prime is 1156552003. The reversal of 1156551998 is 8991556511.

It is a super-2 number, since 2×1156551998² = 2675225048155584008, 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 5 ways as a sum of consecutive naturals, for example, 5900678 + ... + 5900873.

It is an arithmetic number, because the mean of its divisors is an integer number (168172116).

Almost surely, 2^1156551998 is an apocalyptic number.

1156551998 is a deficient number, since it is larger than the sum of its proper divisors (861513394).

1156551998 is a wasteful number, since it uses less digits than its factorization.

1156551998 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11801567 (or 11801560 counting only the distinct ones).

The product of its digits is 486000, while the sum is 50.

The square root of 1156551998 is about 34008.1166488237. The cubic root of 1156551998 is about 1049.6754849002.

The spelling of 1156551998 in words is "one billion, one hundred fifty-six million, five hundred fifty-one thousand, nine hundred ninety-eight".