556921951 has 2 divisors, whose sum is σ = 556921952. Its totient is φ = 556921950.

The previous prime is 556921943. The next prime is 556921957. The reversal of 556921951 is 159129655.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 556921951 - 2³ = 556921943 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 556921898 and 556921907.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (556921957) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 278460975 + 278460976.

It is an arithmetic number, because the mean of its divisors is an integer number (278460976).

Almost surely, 2^556921951 is an apocalyptic number.

556921951 is a deficient number, since it is larger than the sum of its proper divisors (1).

556921951 is an equidigital number, since it uses as much as digits as its factorization.

556921951 is an evil number, because the sum of its binary digits is even.

The product of its digits is 121500, while the sum is 43.

The square root of 556921951 is about 23599.1938633505. The cubic root of 556921951 is about 822.7441038450.

The spelling of 556921951 in words is "five hundred fifty-six million, nine hundred twenty-one thousand, nine hundred fifty-one".