151553721 has 16 divisors (see below), whose sum is σ = 221165568. Its totient is φ = 91549200.

The previous prime is 151553687. The next prime is 151553737. The reversal of 151553721 is 127355151.

It is not a de Polignac number, because 151553721 - 2⁷ = 151553593 is a prime.

It is not an unprimeable number, because it can be changed into a prime (151553741) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2880 + ... + 17646.

It is an arithmetic number, because the mean of its divisors is an integer number (13822848).

Almost surely, 2^151553721 is an apocalyptic number.

151553721 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

151553721 is a deficient number, since it is larger than the sum of its proper divisors (69611847).

151553721 is a wasteful number, since it uses less digits than its factorization.

151553721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15092.

The product of its digits is 5250, while the sum is 30.

The square root of 151553721 is about 12310.7156981225. The cubic root of 151553721 is about 533.1575143982.

The spelling of 151553721 in words is "one hundred fifty-one million, five hundred fifty-three thousand, seven hundred twenty-one".