1391864233 has 2 divisors, whose sum is σ = 1391864234. Its totient is φ = 1391864232.

The previous prime is 1391864203. The next prime is 1391864237. The reversal of 1391864233 is 3324681931.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1391812249 + 51984 = 37307^2 + 228^2 .

It is a cyclic number.

It is not a de Polignac number, because 1391864233 - 2⁹ = 1391863721 is a prime.

It is not a weakly prime, because it can be changed into another prime (1391864237) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 695932116 + 695932117.

It is an arithmetic number, because the mean of its divisors is an integer number (695932117).

Almost surely, 2^1391864233 is an apocalyptic number.

It is an amenable number.

1391864233 is a deficient number, since it is larger than the sum of its proper divisors (1).

1391864233 is an equidigital number, since it uses as much as digits as its factorization.

1391864233 is an evil number, because the sum of its binary digits is even.

The product of its digits is 93312, while the sum is 40.

The square root of 1391864233 is about 37307.6966992067. The cubic root of 1391864233 is about 1116.5177325787.

The spelling of 1391864233 in words is "one billion, three hundred ninety-one million, eight hundred sixty-four thousand, two hundred thirty-three".