1491399113 has 2 divisors, whose sum is σ = 1491399114. Its totient is φ = 1491399112.

The previous prime is 1491399089. The next prime is 1491399121. The reversal of 1491399113 is 3119931941.

1491399113 = 27307² + 27308².

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 745726864 + 745672249 = 27308^2 + 27307^2 .

It is a cyclic number.

It is not a de Polignac number, because 1491399113 - 2¹⁴ = 1491382729 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (1491398113) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 745699556 + 745699557.

It is an arithmetic number, because the mean of its divisors is an integer number (745699557).

Almost surely, 2^1491399113 is an apocalyptic number.

1491399113 is the 27308-th centered square number.

It is an amenable number.

1491399113 is a deficient number, since it is larger than the sum of its proper divisors (1).

1491399113 is an equidigital number, since it uses as much as digits as its factorization.

1491399113 is an evil number, because the sum of its binary digits is even.

The product of its digits is 26244, while the sum is 41.

The square root of 1491399113 is about 38618.6368609769. The cubic root of 1491399113 is about 1142.5221456827.

The spelling of 1491399113 in words is "one billion, four hundred ninety-one million, three hundred ninety-nine thousand, one hundred thirteen".