1572513491 has 2 divisors, whose sum is σ = 1572513492. Its totient is φ = 1572513490.

The previous prime is 1572513479. The next prime is 1572513493. The reversal of 1572513491 is 1943152751.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1572513491 - 2¹⁰ = 1572512467 is a prime.

Together with 1572513493, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (1572513493) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 786256745 + 786256746.

It is an arithmetic number, because the mean of its divisors is an integer number (786256746).

Almost surely, 2^1572513491 is an apocalyptic number.

1572513491 is a deficient number, since it is larger than the sum of its proper divisors (1).

1572513491 is an equidigital number, since it uses as much as digits as its factorization.

1572513491 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 37800, while the sum is 38.

The square root of 1572513491 is about 39654.9302231135. The cubic root of 1572513491 is about 1162.8707855812.

The spelling of 1572513491 in words is "one billion, five hundred seventy-two million, five hundred thirteen thousand, four hundred ninety-one".