1645874539 has 2 divisors, whose sum is σ = 1645874540. Its totient is φ = 1645874538.

The previous prime is 1645874507. The next prime is 1645874543. The reversal of 1645874539 is 9354785461.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1645874539 - 2⁵ = 1645874507 is a prime.

It is not a weakly prime, because it can be changed into another prime (1645874039) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 822937269 + 822937270.

It is an arithmetic number, because the mean of its divisors is an integer number (822937270).

Almost surely, 2^1645874539 is an apocalyptic number.

1645874539 is a deficient number, since it is larger than the sum of its proper divisors (1).

1645874539 is an equidigital number, since it uses as much as digits as its factorization.

1645874539 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3628800, while the sum is 52.

The square root of 1645874539 is about 40569.3793272710. The cubic root of 1645874539 is about 1180.6800970320.

The spelling of 1645874539 in words is "one billion, six hundred forty-five million, eight hundred seventy-four thousand, five hundred thirty-nine".