1539705157 has 2 divisors, whose sum is σ = 1539705158. Its totient is φ = 1539705156.

The previous prime is 1539705143. The next prime is 1539705203. The reversal of 1539705157 is 7515079351.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1404075841 + 135629316 = 37471^2 + 11646^2 .

It is a cyclic number.

It is not a de Polignac number, because 1539705157 - 2¹⁹ = 1539180869 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1539705127) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 769852578 + 769852579.

It is an arithmetic number, because the mean of its divisors is an integer number (769852579).

Almost surely, 2^1539705157 is an apocalyptic number.

It is an amenable number.

1539705157 is a deficient number, since it is larger than the sum of its proper divisors (1).

1539705157 is an equidigital number, since it uses as much as digits as its factorization.

1539705157 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 165375, while the sum is 43.

The square root of 1539705157 is about 39239.0769131997. The cubic root of 1539705157 is about 1154.7266475791.

The spelling of 1539705157 in words is "one billion, five hundred thirty-nine million, seven hundred five thousand, one hundred fifty-seven".