194115557 has 2 divisors, whose sum is σ = 194115558. Its totient is φ = 194115556.

The previous prime is 194115553. The next prime is 194115587. The reversal of 194115557 is 755511491.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 193738561 + 376996 = 13919^2 + 614^2 .

It is a cyclic number.

It is not a de Polignac number, because 194115557 - 2² = 194115553 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 194115557.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (194115553) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 97057778 + 97057779.

It is an arithmetic number, because the mean of its divisors is an integer number (97057779).

Almost surely, 2^194115557 is an apocalyptic number.

It is an amenable number.

194115557 is a deficient number, since it is larger than the sum of its proper divisors (1).

194115557 is an equidigital number, since it uses as much as digits as its factorization.

194115557 is an evil number, because the sum of its binary digits is even.

The product of its digits is 31500, while the sum is 38.

The square root of 194115557 is about 13932.5359141830. The cubic root of 194115557 is about 579.0109550955.

The spelling of 194115557 in words is "one hundred ninety-four million, one hundred fifteen thousand, five hundred fifty-seven".