1551151555 has 16 divisors (see below), whose sum is σ = 1938631104. Its totient is φ = 1190367360.

The previous prime is 1551151549. The next prime is 1551151571. The reversal of 1551151555 is 5551511551.

It is not a de Polignac number, because 1551151555 - 2¹⁵ = 1551118787 is a prime.

It is a super-2 number, since 2×1551151555² = 4812142293157836050, which contains 22 as substring.

It is a nude number because it is divisible by every one of its digits.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1551151555.

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, 45912 + ... + 72181.

It is an arithmetic number, because the mean of its divisors is an integer number (121164444).

Almost surely, 2^1551151555 is an apocalyptic number.

1551151555 is a deficient number, since it is larger than the sum of its proper divisors (387479549).

1551151555 is a wasteful number, since it uses less digits than its factorization.

1551151555 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 118206.

The product of its digits is 15625, while the sum is 34.

The square root of 1551151555 is about 39384.6614178667. The cubic root of 1551151555 is about 1157.5810559512.

The spelling of 1551151555 in words is "one billion, five hundred fifty-one million, one hundred fifty-one thousand, five hundred fifty-five".