1551656121 has 8 divisors (see below), whose sum is σ = 2069285760. Its totient is φ = 1034231952.

The previous prime is 1551656101. The next prime is 1551656123. The reversal of 1551656121 is 1216561551.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1551656121 - 2⁵ = 1551656089 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1551656123) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 32785 + ... + 64638.

It is an arithmetic number, because the mean of its divisors is an integer number (258660720).

Almost surely, 2^1551656121 is an apocalyptic number.

It is an amenable number.

1551656121 is a deficient number, since it is larger than the sum of its proper divisors (517629639).

1551656121 is an equidigital number, since it uses as much as digits as its factorization.

1551656121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 102735.

The product of its digits is 9000, while the sum is 33.

The square root of 1551656121 is about 39391.0665125990. The cubic root of 1551656121 is about 1157.7065568459.

The spelling of 1551656121 in words is "one billion, five hundred fifty-one million, six hundred fifty-six thousand, one hundred twenty-one".