151555561 has 8 divisors (see below), whose sum is σ = 160741800. Its totient is φ = 142399488.

The previous prime is 151555553. The next prime is 151555583. The reversal of 151555561 is 165555151.

It can be written as a sum of positive squares in 4 ways, for example, as 43811161 + 107744400 = 6619^2 + 10380^2 .

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 151555561 - 2³ = 151555553 is a prime.

It is a super-3 number, since 3×151555561³ (a number of 26 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (151555361) 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, 3265 + ... + 17713.

It is an arithmetic number, because the mean of its divisors is an integer number (20092725).

Almost surely, 2^151555561 is an apocalyptic number.

It is an amenable number.

151555561 is a deficient number, since it is larger than the sum of its proper divisors (9186239).

151555561 is a wasteful number, since it uses less digits than its factorization.

151555561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15083.

The product of its digits is 18750, while the sum is 34.

The square root of 151555561 is about 12310.7904295378. The cubic root of 151555561 is about 533.1596720619.

The spelling of 151555561 in words is "one hundred fifty-one million, five hundred fifty-five thousand, five hundred sixty-one".