151566621 has 4 divisors (see below), whose sum is σ = 202088832. Its totient is φ = 101044412.

The previous prime is 151566599. The next prime is 151566661. The reversal of 151566621 is 126665151.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 151566621 - 2¹⁵ = 151533853 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (151566661) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 25261101 + ... + 25261106.

It is an arithmetic number, because the mean of its divisors is an integer number (50522208).

Almost surely, 2^151566621 is an apocalyptic number.

It is an amenable number.

151566621 is a deficient number, since it is larger than the sum of its proper divisors (50522211).

151566621 is an equidigital number, since it uses as much as digits as its factorization.

151566621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 50522210.

The product of its digits is 10800, while the sum is 33.

The square root of 151566621 is about 12311.2396207693. The cubic root of 151566621 is about 533.1726411286.

The spelling of 151566621 in words is "one hundred fifty-one million, five hundred sixty-six thousand, six hundred twenty-one".