2155242500 has 30 divisors (see below), whose sum is σ = 4713089766. Its totient is φ = 862096000.

The previous prime is 2155242493. The next prime is 2155242521. The reversal of 2155242500 is 52425512.

It can be written as a sum of positive squares in 5 ways, for example, as 1636040704 + 519201796 = 40448^2 + 22786^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 2155242500.

It is an unprimeable number.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 428549 + ... + 433548.

Almost surely, 2^2155242500 is an apocalyptic number.

2155242500 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2155242500 is an abundant number, since it is smaller than the sum of its proper divisors (2557847266).

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

2155242500 is an equidigital number, since it uses as much as digits as its factorization.

2155242500 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 862121 (or 862104 counting only the distinct ones).

The product of its (nonzero) digits is 4000, while the sum is 26.

The square root of 2155242500 is about 46424.5893896758. The cubic root of 2155242500 is about 1291.7110679615.

The spelling of 2155242500 in words is "two billion, one hundred fifty-five million, two hundred forty-two thousand, five hundred".