1291529923 has 2 divisors, whose sum is σ = 1291529924. Its totient is φ = 1291529922.

The previous prime is 1291529909. The next prime is 1291529927. The reversal of 1291529923 is 3299251921.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1291529923 - 2²⁹ = 754659011 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1291529923.

It is not a weakly prime, because it can be changed into another prime (1291529927) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 645764961 + 645764962.

It is an arithmetic number, because the mean of its divisors is an integer number (645764962).

Almost surely, 2^1291529923 is an apocalyptic number.

1291529923 is a deficient number, since it is larger than the sum of its proper divisors (1).

1291529923 is an equidigital number, since it uses as much as digits as its factorization.

1291529923 is an evil number, because the sum of its binary digits is even.

The product of its digits is 87480, while the sum is 43.

The square root of 1291529923 is about 35937.8619703510. The cubic root of 1291529923 is about 1089.0174134728.

The spelling of 1291529923 in words is "one billion, two hundred ninety-one million, five hundred twenty-nine thousand, nine hundred twenty-three".