491507293 has 2 divisors, whose sum is σ = 491507294. Its totient is φ = 491507292.

The previous prime is 491507273. The next prime is 491507299. The reversal of 491507293 is 392705194.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 464747364 + 26759929 = 21558^2 + 5173^2 .

It is a cyclic number.

It is not a de Polignac number, because 491507293 - 2²⁵ = 457952861 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (491507299) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 245753646 + 245753647.

It is an arithmetic number, because the mean of its divisors is an integer number (245753647).

Almost surely, 2^491507293 is an apocalyptic number.

It is an amenable number.

491507293 is a deficient number, since it is larger than the sum of its proper divisors (1).

491507293 is an equidigital number, since it uses as much as digits as its factorization.

491507293 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 68040, while the sum is 40.

The square root of 491507293 is about 22169.9637573001. The cubic root of 491507293 is about 789.1810629119.

The spelling of 491507293 in words is "four hundred ninety-one million, five hundred seven thousand, two hundred ninety-three".