1915263991 has 2 divisors, whose sum is σ = 1915263992. Its totient is φ = 1915263990.

The previous prime is 1915263983. The next prime is 1915263997. The reversal of 1915263991 is 1993625191.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1915263991 - 2³ = 1915263983 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1915263997) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 957631995 + 957631996.

It is an arithmetic number, because the mean of its divisors is an integer number (957631996).

Almost surely, 2^1915263991 is an apocalyptic number.

1915263991 is a deficient number, since it is larger than the sum of its proper divisors (1).

1915263991 is an equidigital number, since it uses as much as digits as its factorization.

1915263991 is an evil number, because the sum of its binary digits is even.

The product of its digits is 131220, while the sum is 46.

The square root of 1915263991 is about 43763.7291715411. The cubic root of 1915263991 is about 1241.8702247795.

The spelling of 1915263991 in words is "one billion, nine hundred fifteen million, two hundred sixty-three thousand, nine hundred ninety-one".