151611561 has 16 divisors (see below), whose sum is σ = 234376320. Its totient is φ = 96679440.

The previous prime is 151611547. The next prime is 151611569. The reversal of 151611561 is 165116151.

It is not a de Polignac number, because 151611561 - 2⁵ = 151611529 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (151611569) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 121450 + ... + 122691.

It is an arithmetic number, because the mean of its divisors is an integer number (14648520).

Almost surely, 2^151611561 is an apocalyptic number.

It is an amenable number.

151611561 is a deficient number, since it is larger than the sum of its proper divisors (82764759).

151611561 is a wasteful number, since it uses less digits than its factorization.

151611561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 244173 (or 244167 counting only the distinct ones).

The product of its digits is 900, while the sum is 27.

The square root of 151611561 is about 12313.0646469512. The cubic root of 151611561 is about 533.2253317333.

The spelling of 151611561 in words is "one hundred fifty-one million, six hundred eleven thousand, five hundred sixty-one".