1511551161 has 24 divisors (see below), whose sum is σ = 2258081280. Its totient is φ = 973754496.

The previous prime is 1511551157. The next prime is 1511551189. The reversal of 1511551161 is 1611551151.

1511551161 is a `hidden beast` number, since 1 + 51 + 1 + 551 + 1 + 61 = 666.

It is not a de Polignac number, because 1511551161 - 2² = 1511551157 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1511556161) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 10801 + ... + 56033.

It is an arithmetic number, because the mean of its divisors is an integer number (94086720).

Almost surely, 2^1511551161 is an apocalyptic number.

It is an amenable number.

1511551161 is a deficient number, since it is larger than the sum of its proper divisors (746530119).

1511551161 is a wasteful number, since it uses less digits than its factorization.

1511551161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45365 (or 45362 counting only the distinct ones).

The product of its digits is 750, while the sum is 27.

The square root of 1511551161 is about 38878.6723152939. The cubic root of 1511551161 is about 1147.6451272439.

The spelling of 1511551161 in words is "one billion, five hundred eleven million, five hundred fifty-one thousand, one hundred sixty-one".