151556561 has 8 divisors (see below), whose sum is σ = 163868544. Its totient is φ = 139338000.

The previous prime is 151556501. The next prime is 151556563. The reversal of 151556561 is 165655151.

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 151556561 - 2⁶ = 151556497 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (151556563) 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, 19961 + ... + 26486.

It is an arithmetic number, because the mean of its divisors is an integer number (20483568).

Almost surely, 2^151556561 is an apocalyptic number.

It is an amenable number.

151556561 is a deficient number, since it is larger than the sum of its proper divisors (12311983).

151556561 is a wasteful number, since it uses less digits than its factorization.

151556561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 46711.

The product of its digits is 22500, while the sum is 35.

The square root of 151556561 is about 12310.8310442472. The cubic root of 151556561 is about 533.1608446978.

The spelling of 151556561 in words is "one hundred fifty-one million, five hundred fifty-six thousand, five hundred sixty-one".