491074651 has 2 divisors, whose sum is σ = 491074652. Its totient is φ = 491074650.

The previous prime is 491074643. The next prime is 491074657. The reversal of 491074651 is 156470194.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 491074651 - 2³ = 491074643 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 491074651.

It is not a weakly prime, because it can be changed into another prime (491074657) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 245537325 + 245537326.

It is an arithmetic number, because the mean of its divisors is an integer number (245537326).

Almost surely, 2^491074651 is an apocalyptic number.

491074651 is a deficient number, since it is larger than the sum of its proper divisors (1).

491074651 is an equidigital number, since it uses as much as digits as its factorization.

491074651 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 30240, while the sum is 37.

The square root of 491074651 is about 22160.2042183731. The cubic root of 491074651 is about 788.9494399650.

The spelling of 491074651 in words is "four hundred ninety-one million, seventy-four thousand, six hundred fifty-one".