120857557 has 2 divisors, whose sum is σ = 120857558. Its totient is φ = 120857556.

The previous prime is 120857497. The next prime is 120857567. The reversal of 120857557 is 755758021.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 119924401 + 933156 = 10951^2 + 966^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-120857557 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (120857567) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60428778 + 60428779.

It is an arithmetic number, because the mean of its divisors is an integer number (60428779).

Almost surely, 2^120857557 is an apocalyptic number.

It is an amenable number.

120857557 is a deficient number, since it is larger than the sum of its proper divisors (1).

120857557 is an equidigital number, since it uses as much as digits as its factorization.

120857557 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 98000, while the sum is 40.

The square root of 120857557 is about 10993.5234115364. The cubic root of 120857557 is about 494.4145811905.

The spelling of 120857557 in words is "one hundred twenty million, eight hundred fifty-seven thousand, five hundred fifty-seven".