1551020155 has 16 divisors (see below), whose sum is σ = 1877307840. Its totient is φ = 1230118912.

The previous prime is 1551020147. The next prime is 1551020167. The reversal of 1551020155 is 5510201551.

It is a cyclic number.

It is not a de Polignac number, because 1551020155 - 2³ = 1551020147 is a prime.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 964362 + ... + 965968.

It is an arithmetic number, because the mean of its divisors is an integer number (117331740).

Almost surely, 2^1551020155 is an apocalyptic number.

1551020155 is a deficient number, since it is larger than the sum of its proper divisors (326287685).

1551020155 is a wasteful number, since it uses less digits than its factorization.

1551020155 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3158.

The product of its (nonzero) digits is 1250, while the sum is 25.

The square root of 1551020155 is about 39382.9932204245. The cubic root of 1551020155 is about 1157.5483683122.

The spelling of 1551020155 in words is "one billion, five hundred fifty-one million, twenty thousand, one hundred fifty-five".