1331145923 has 2 divisors, whose sum is σ = 1331145924. Its totient is φ = 1331145922.

The previous prime is 1331145913. The next prime is 1331145931. The reversal of 1331145923 is 3295411331.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1331145923 - 2⁸ = 1331145667 is a prime.

It is a Sophie Germain prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1331145923.

It is not a weakly prime, because it can be changed into another prime (1331145913) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 665572961 + 665572962.

It is an arithmetic number, because the mean of its divisors is an integer number (665572962).

Almost surely, 2^1331145923 is an apocalyptic number.

1331145923 is a deficient number, since it is larger than the sum of its proper divisors (1).

1331145923 is an equidigital number, since it uses as much as digits as its factorization.

1331145923 is an evil number, because the sum of its binary digits is even.

The product of its digits is 9720, while the sum is 32.

The square root of 1331145923 is about 36484.8725227319. The cubic root of 1331145923 is about 1100.0401977046.

The spelling of 1331145923 in words is "one billion, three hundred thirty-one million, one hundred forty-five thousand, nine hundred twenty-three".