1557542261 has 8 divisors (see below), whose sum is σ = 1799086464. Its totient is φ = 1332656320.

The previous prime is 1557542249. The next prime is 1557542263. The reversal of 1557542261 is 1622457551.

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 1557542261 - 2¹⁴ = 1557525877 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 (1557542263) 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, 4164365 + ... + 4164738.

It is an arithmetic number, because the mean of its divisors is an integer number (224885808).

Almost surely, 2^1557542261 is an apocalyptic number.

1557542261 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1557542261 is a deficient number, since it is larger than the sum of its proper divisors (241544203).

1557542261 is a wasteful number, since it uses less digits than its factorization.

1557542261 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8329131.

The product of its digits is 84000, while the sum is 38.

The square root of 1557542261 is about 39465.7099391358. The cubic root of 1557542261 is about 1159.1686128078.

The spelling of 1557542261 in words is "one billion, five hundred fifty-seven million, five hundred forty-two thousand, two hundred sixty-one".