151221551 has 16 divisors (see below), whose sum is σ = 173859840. Its totient is φ = 130364640.

The previous prime is 151221547. The next prime is 151221557. The reversal of 151221551 is 155122151.

151221551 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a cyclic number.

It is not a de Polignac number, because 151221551 - 2² = 151221547 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 (151221557) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 13226 + ... + 21848.

It is an arithmetic number, because the mean of its divisors is an integer number (10866240).

Almost surely, 2^151221551 is an apocalyptic number.

151221551 is a deficient number, since it is larger than the sum of its proper divisors (22638289).

151221551 is a wasteful number, since it uses less digits than its factorization.

151221551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8726.

The product of its digits is 500, while the sum is 23.

The square root of 151221551 is about 12297.2172055307. The cubic root of 151221551 is about 532.7677109795.

The spelling of 151221551 in words is "one hundred fifty-one million, two hundred twenty-one thousand, five hundred fifty-one".