1557843097 has 2 divisors, whose sum is σ = 1557843098. Its totient is φ = 1557843096.

The previous prime is 1557843037. The next prime is 1557843113. The reversal of 1557843097 is 7903487551.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1484637961 + 73205136 = 38531^2 + 8556^2 .

It is a cyclic number.

It is not a de Polignac number, because 1557843097 - 2¹⁹ = 1557318809 is a prime.

It is a super-2 number, since 2×1557843097² = 4853750229741102818, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 1557843097.

It is not a weakly prime, because it can be changed into another prime (1557843037) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 778921548 + 778921549.

It is an arithmetic number, because the mean of its divisors is an integer number (778921549).

Almost surely, 2^1557843097 is an apocalyptic number.

It is an amenable number.

1557843097 is a deficient number, since it is larger than the sum of its proper divisors (1).

1557843097 is an equidigital number, since it uses as much as digits as its factorization.

1557843097 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1058400, while the sum is 49.

The square root of 1557843097 is about 39469.5211143991. The cubic root of 1557843097 is about 1159.2432383270.

The spelling of 1557843097 in words is "one billion, five hundred fifty-seven million, eight hundred forty-three thousand, ninety-seven".