1540152557 has 2 divisors, whose sum is σ = 1540152558. Its totient is φ = 1540152556.

The previous prime is 1540152469. The next prime is 1540152563. The reversal of 1540152557 is 7552510451.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1240377961 + 299774596 = 35219^2 + 17314^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1540152557 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1540155557) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 770076278 + 770076279.

It is an arithmetic number, because the mean of its divisors is an integer number (770076279).

Almost surely, 2^1540152557 is an apocalyptic number.

It is an amenable number.

1540152557 is a deficient number, since it is larger than the sum of its proper divisors (1).

1540152557 is an equidigital number, since it uses as much as digits as its factorization.

1540152557 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 35000, while the sum is 35.

The square root of 1540152557 is about 39244.7774487256. Note that the first 3 decimals coincide. The cubic root of 1540152557 is about 1154.8384816898.

The spelling of 1540152557 in words is "one billion, five hundred forty million, one hundred fifty-two thousand, five hundred fifty-seven".