1551225155 has 16 divisors (see below), whose sum is σ = 1876289184. Its totient is φ = 1231127040.

The previous prime is 1551225149. The next prime is 1551225187. The reversal of 1551225155 is 5515221551.

It is not a de Polignac number, because 1551225155 - 2¹⁰ = 1551224131 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 690464 + ... + 692706.

It is an arithmetic number, because the mean of its divisors is an integer number (117268074).

Almost surely, 2^1551225155 is an apocalyptic number.

1551225155 is a deficient number, since it is larger than the sum of its proper divisors (325064029).

1551225155 is a wasteful number, since it uses less digits than its factorization.

1551225155 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3286.

The product of its digits is 12500, while the sum is 32.

The square root of 1551225155 is about 39385.5957806912. The cubic root of 1551225155 is about 1157.5993642026.

The spelling of 1551225155 in words is "one billion, five hundred fifty-one million, two hundred twenty-five thousand, one hundred fifty-five".