1557421541 has 8 divisors (see below), whose sum is σ = 1686595680. Its totient is φ = 1429586352.

The previous prime is 1557421529. The next prime is 1557421543. The reversal of 1557421541 is 1451247551.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1557421541 - 2⁶ = 1557421477 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1557421543) 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, 332315 + ... + 336968.

It is an arithmetic number, because the mean of its divisors is an integer number (210824460).

Almost surely, 2^1557421541 is an apocalyptic number.

It is an amenable number.

1557421541 is a deficient number, since it is larger than the sum of its proper divisors (129174139).

1557421541 is a wasteful number, since it uses less digits than its factorization.

1557421541 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 669475.

The product of its digits is 28000, while the sum is 35.

The square root of 1557421541 is about 39464.1804805320. The cubic root of 1557421541 is about 1159.1386642463.

The spelling of 1557421541 in words is "one billion, five hundred fifty-seven million, four hundred twenty-one thousand, five hundred forty-one".