2154155508 has 18 divisors (see below), whose sum is σ = 5445226514. Its totient is φ = 718051824.

The previous prime is 2154155501. The next prime is 2154155567. The reversal of 2154155508 is 8055514512.

It can be written as a sum of positive squares in only one way, i.e., 1988981604 + 165173904 = 44598^2 + 12852^2 .

It is a tau number, because it is divible by the number of its divisors (18).

It is a Harshad number since it is a multiple of its sum of digits (36), and also a Moran number because the ratio is a prime number: 59837653 = 2154155508 / (2 + 1 + 5 + 4 + 1 + 5 + 5 + 5 + 0 + 8).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2154155501) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 29918791 + ... + 29918862.

Almost surely, 2^2154155508 is an apocalyptic number.

It is an amenable number.

2154155508 is an abundant number, since it is smaller than the sum of its proper divisors (3291071006).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

2154155508 is a wasteful number, since it uses less digits than its factorization.

2154155508 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 59837663 (or 59837658 counting only the distinct ones).

The product of its (nonzero) digits is 40000, while the sum is 36.

The square root of 2154155508 is about 46412.8808414216. The cubic root of 2154155508 is about 1291.4938741946.

The spelling of 2154155508 in words is "two billion, one hundred fifty-four million, one hundred fifty-five thousand, five hundred eight".