1491277313 has 2 divisors, whose sum is σ = 1491277314. Its totient is φ = 1491277312.

The previous prime is 1491277283. The next prime is 1491277327. The reversal of 1491277313 is 3137721941.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1491272689 + 4624 = 38617^2 + 68^2 .

It is a cyclic number.

It is not a de Polignac number, because 1491277313 - 2¹⁰ = 1491276289 is a prime.

It is not a weakly prime, because it can be changed into another prime (1491277813) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 745638656 + 745638657.

It is an arithmetic number, because the mean of its divisors is an integer number (745638657).

Almost surely, 2^1491277313 is an apocalyptic number.

It is an amenable number.

1491277313 is a deficient number, since it is larger than the sum of its proper divisors (1).

1491277313 is an equidigital number, since it uses as much as digits as its factorization.

1491277313 is an evil number, because the sum of its binary digits is even.

The product of its digits is 31752, while the sum is 38.

The square root of 1491277313 is about 38617.0598699590. The cubic root of 1491277313 is about 1142.4910422299.

The spelling of 1491277313 in words is "one billion, four hundred ninety-one million, two hundred seventy-seven thousand, three hundred thirteen".