1557149500 has 24 divisors (see below), whose sum is σ = 3400815600. Its totient is φ = 622859600.

The previous prime is 1557149491. The next prime is 1557149507. The reversal of 1557149500 is 59417551.

It is a self number, because there is not a number n which added to its sum of digits gives 1557149500.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1557149507) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1556650 + ... + 1557649.

It is an arithmetic number, because the mean of its divisors is an integer number (141700650).

Almost surely, 2^1557149500 is an apocalyptic number.

1557149500 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1557149500 is an abundant number, since it is smaller than the sum of its proper divisors (1843666100).

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

1557149500 is a wasteful number, since it uses less digits than its factorization.

1557149500 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3114318 (or 3114306 counting only the distinct ones).

The product of its (nonzero) digits is 31500, while the sum is 37.

The square root of 1557149500 is about 39460.7336475134. The cubic root of 1557149500 is about 1159.0711698664.

The spelling of 1557149500 in words is "one billion, five hundred fifty-seven million, one hundred forty-nine thousand, five hundred".