1291689925 has 12 divisors (see below), whose sum is σ = 1608084576. Its totient is φ = 1029230000.

The previous prime is 1291689923. The next prime is 1291689947. The reversal of 1291689925 is 5299861921.

It is not a de Polignac number, because 1291689925 - 2¹ = 1291689923 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1291689923) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 96649 + ... + 109198.

It is an arithmetic number, because the mean of its divisors is an integer number (134007048).

Almost surely, 2^1291689925 is an apocalyptic number.

It is an amenable number.

1291689925 is a deficient number, since it is larger than the sum of its proper divisors (316394651).

1291689925 is a wasteful number, since it uses less digits than its factorization.

1291689925 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 206108 (or 206103 counting only the distinct ones).

The product of its digits is 699840, while the sum is 52.

The square root of 1291689925 is about 35940.0879937710. The cubic root of 1291689925 is about 1089.0623828192.

The spelling of 1291689925 in words is "one billion, two hundred ninety-one million, six hundred eighty-nine thousand, nine hundred twenty-five".