1491757249 has 2 divisors, whose sum is σ = 1491757250. Its totient is φ = 1491757248.

The previous prime is 1491757219. The next prime is 1491757261. The reversal of 1491757249 is 9427571941.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1478940849 + 12816400 = 38457^2 + 3580^2 .

It is a cyclic number.

It is not a de Polignac number, because 1491757249 - 2¹³ = 1491749057 is a prime.

It is not a weakly prime, because it can be changed into another prime (1491757219) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 745878624 + 745878625.

It is an arithmetic number, because the mean of its divisors is an integer number (745878625).

Almost surely, 2^1491757249 is an apocalyptic number.

It is an amenable number.

1491757249 is a deficient number, since it is larger than the sum of its proper divisors (1).

1491757249 is an equidigital number, since it uses as much as digits as its factorization.

1491757249 is an evil number, because the sum of its binary digits is even.

The product of its digits is 635040, while the sum is 49.

The square root of 1491757249 is about 38623.2734112478. The cubic root of 1491757249 is about 1142.6135912609.

The spelling of 1491757249 in words is "one billion, four hundred ninety-one million, seven hundred fifty-seven thousand, two hundred forty-nine".