556981157 has 2 divisors, whose sum is σ = 556981158. Its totient is φ = 556981156.

The previous prime is 556981127. The next prime is 556981169. The reversal of 556981157 is 751189655.

556981157 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 551968036 + 5013121 = 23494^2 + 2239^2 .

It is a cyclic number.

It is not a de Polignac number, because 556981157 - 2²⁶ = 489872293 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (556981127) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 278490578 + 278490579.

It is an arithmetic number, because the mean of its divisors is an integer number (278490579).

Almost surely, 2^556981157 is an apocalyptic number.

It is an amenable number.

556981157 is a deficient number, since it is larger than the sum of its proper divisors (1).

556981157 is an equidigital number, since it uses as much as digits as its factorization.

556981157 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 378000, while the sum is 47.

The square root of 556981157 is about 23600.4482372687. The cubic root of 556981157 is about 822.7732579369.

The spelling of 556981157 in words is "five hundred fifty-six million, nine hundred eighty-one thousand, one hundred fifty-seven".