1557420503 has 2 divisors, whose sum is σ = 1557420504. Its totient is φ = 1557420502.

The previous prime is 1557420497. The next prime is 1557420509. The reversal of 1557420503 is 3050247551.

It is a balanced prime because it is at equal distance from previous prime (1557420497) and next prime (1557420509).

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1557420503 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1557420503.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1557420509) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 778710251 + 778710252.

It is an arithmetic number, because the mean of its divisors is an integer number (778710252).

Almost surely, 2^1557420503 is an apocalyptic number.

1557420503 is a deficient number, since it is larger than the sum of its proper divisors (1).

1557420503 is an equidigital number, since it uses as much as digits as its factorization.

1557420503 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 21000, while the sum is 32.

The square root of 1557420503 is about 39464.1673293635. The cubic root of 1557420503 is about 1159.1384067296.

The spelling of 1557420503 in words is "one billion, five hundred fifty-seven million, four hundred twenty thousand, five hundred three".