491000279251 has 2 divisors, whose sum is σ = 491000279252. Its totient is φ = 491000279250.

The previous prime is 491000279227. The next prime is 491000279257. The reversal of 491000279251 is 152972000194.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 491000279251 - 2¹¹ = 491000277203 is a prime.

It is a super-2 number, since 2×491000279251² (a number of 24 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (491000279257) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 245500139625 + 245500139626.

It is an arithmetic number, because the mean of its divisors is an integer number (245500139626).

Almost surely, 2^491000279251 is an apocalyptic number.

491000279251 is a deficient number, since it is larger than the sum of its proper divisors (1).

491000279251 is an equidigital number, since it uses as much as digits as its factorization.

491000279251 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 45360, while the sum is 40.

The spelling of 491000279251 in words is "four hundred ninety-one billion, two hundred seventy-nine thousand, two hundred fifty-one".