1557612541 has 2 divisors, whose sum is σ = 1557612542. Its totient is φ = 1557612540.

The previous prime is 1557612527. The next prime is 1557612547. The reversal of 1557612541 is 1452167551.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1555986916 + 1625625 = 39446^2 + 1275^2 .

It is a cyclic number.

It is not a de Polignac number, because 1557612541 - 2¹⁵ = 1557579773 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1557612541.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1557612547) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 778806270 + 778806271.

It is an arithmetic number, because the mean of its divisors is an integer number (778806271).

Almost surely, 2^1557612541 is an apocalyptic number.

It is an amenable number.

1557612541 is a deficient number, since it is larger than the sum of its proper divisors (1).

1557612541 is an equidigital number, since it uses as much as digits as its factorization.

1557612541 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 42000, while the sum is 37.

The square root of 1557612541 is about 39466.6003222978. The cubic root of 1557612541 is about 1159.1860473577.

The spelling of 1557612541 in words is "one billion, five hundred fifty-seven million, six hundred twelve thousand, five hundred forty-one".