1291923425 has 24 divisors (see below), whose sum is σ = 1726957176. Its totient is φ = 953072640.

The previous prime is 1291923401. The next prime is 1291923443. The reversal of 1291923425 is 5243291921.

It is a happy number.

It can be written as a sum of positive squares in 12 ways, for example, as 374499904 + 917423521 = 19352^2 + 30289^2 .

It is not a de Polignac number, because 1291923425 - 2¹² = 1291919329 is a prime.

It is a super-2 number, since 2×1291923425² = 3338132272127461250, which contains 22 as substring.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 576407 + ... + 578643.

It is an arithmetic number, because the mean of its divisors is an integer number (71956549).

Almost surely, 2^1291923425 is an apocalyptic number.

It is an amenable number.

1291923425 is a deficient number, since it is larger than the sum of its proper divisors (435033751).

1291923425 is a wasteful number, since it uses less digits than its factorization.

1291923425 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4037 (or 4032 counting only the distinct ones).

The product of its digits is 38880, while the sum is 38.

The square root of 1291923425 is about 35943.3363086957. The cubic root of 1291923425 is about 1089.1280024750.

The spelling of 1291923425 in words is "one billion, two hundred ninety-one million, nine hundred twenty-three thousand, four hundred twenty-five".