491556151 has 2 divisors, whose sum is σ = 491556152. Its totient is φ = 491556150.

The previous prime is 491556113. The next prime is 491556203. The reversal of 491556151 is 151655194.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 491556151 - 2¹¹ = 491554103 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 491556151.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (491556551) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 245778075 + 245778076.

It is an arithmetic number, because the mean of its divisors is an integer number (245778076).

Almost surely, 2^491556151 is an apocalyptic number.

491556151 is a deficient number, since it is larger than the sum of its proper divisors (1).

491556151 is an equidigital number, since it uses as much as digits as its factorization.

491556151 is an evil number, because the sum of its binary digits is even.

The product of its digits is 27000, while the sum is 37.

The square root of 491556151 is about 22171.0656261714. The cubic root of 491556151 is about 789.2072114088.

The spelling of 491556151 in words is "four hundred ninety-one million, five hundred fifty-six thousand, one hundred fifty-one".