151655621 has 4 divisors (see below), whose sum is σ = 163321452. Its totient is φ = 139989792.

The previous prime is 151655611. The next prime is 151655633. The reversal of 151655621 is 126556151.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 23716900 + 127938721 = 4870^2 + 11311^2 .

It is a cyclic number.

It is not a de Polignac number, because 151655621 - 2¹⁰ = 151654597 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (151655611) 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, 5832896 + ... + 5832921.

It is an arithmetic number, because the mean of its divisors is an integer number (40830363).

Almost surely, 2^151655621 is an apocalyptic number.

It is an amenable number.

151655621 is a deficient number, since it is larger than the sum of its proper divisors (11665831).

151655621 is a wasteful number, since it uses less digits than its factorization.

151655621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11665830.

The product of its digits is 9000, while the sum is 32.

The square root of 151655621 is about 12314.8536735115. The cubic root of 151655621 is about 533.2769804608.

The spelling of 151655621 in words is "one hundred fifty-one million, six hundred fifty-five thousand, six hundred twenty-one".