157542557 has 2 divisors, whose sum is σ = 157542558. Its totient is φ = 157542556.

The previous prime is 157542551. The next prime is 157542569. The reversal of 157542557 is 755245751.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 140683321 + 16859236 = 11861^2 + 4106^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-157542557 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (157542551) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 78771278 + 78771279.

It is an arithmetic number, because the mean of its divisors is an integer number (78771279).

Almost surely, 2^157542557 is an apocalyptic number.

It is an amenable number.

157542557 is a deficient number, since it is larger than the sum of its proper divisors (1).

157542557 is an equidigital number, since it uses as much as digits as its factorization.

157542557 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 245000, while the sum is 41.

The square root of 157542557 is about 12551.5957949577. The cubic root of 157542557 is about 540.0897850250.

The spelling of 157542557 in words is "one hundred fifty-seven million, five hundred forty-two thousand, five hundred fifty-seven".