151566021 has 48 divisors (see below), whose sum is σ = 243734400. Its totient is φ = 90326016.

The previous prime is 151566011. The next prime is 151566047. The reversal of 151566021 is 120665151.

It is a happy number.

151566021 is a `hidden beast` number, since 1 + 5 + 1 + 56 + 602 + 1 = 666.

It is not a de Polignac number, because 151566021 - 2⁵ = 151565989 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (151566001) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 349821 + ... + 350253.

It is an arithmetic number, because the mean of its divisors is an integer number (5077800).

Almost surely, 2^151566021 is an apocalyptic number.

It is an amenable number.

151566021 is a deficient number, since it is larger than the sum of its proper divisors (92168379).

151566021 is a wasteful number, since it uses less digits than its factorization.

151566021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 570 (or 567 counting only the distinct ones).

The product of its (nonzero) digits is 1800, while the sum is 27.

The square root of 151566021 is about 12311.2152527685. The cubic root of 151566021 is about 533.1719375788.

The spelling of 151566021 in words is "one hundred fifty-one million, five hundred sixty-six thousand, twenty-one".