491396051 has 2 divisors, whose sum is σ = 491396052. Its totient is φ = 491396050.

The previous prime is 491395987. The next prime is 491396057. The reversal of 491396051 is 150693194.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 491396051 - 2⁶ = 491395987 is a prime.

It is a super-3 number, since 3×491396051³ (a number of 27 digits) contains 333 as substring.

It is a Sophie Germain prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 491395996 and 491396014.

It is not a weakly prime, because it can be changed into another prime (491396057) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 245698025 + 245698026.

It is an arithmetic number, because the mean of its divisors is an integer number (245698026).

Almost surely, 2^491396051 is an apocalyptic number.

491396051 is a deficient number, since it is larger than the sum of its proper divisors (1).

491396051 is an equidigital number, since it uses as much as digits as its factorization.

491396051 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 29160, while the sum is 38.

The square root of 491396051 is about 22167.4547704512. The cubic root of 491396051 is about 789.1215204222.

The spelling of 491396051 in words is "four hundred ninety-one million, three hundred ninety-six thousand, fifty-one".