1291625025 has 24 divisors (see below), whose sum is σ = 2138345280. Its totient is φ = 687944640.

The previous prime is 1291625021. The next prime is 1291625063. The reversal of 1291625025 is 5205261921.

It is not a de Polignac number, because 1291625025 - 2² = 1291625021 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1291625021) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 46836 + ... + 69114.

It is an arithmetic number, because the mean of its divisors is an integer number (89097720).

Almost surely, 2^1291625025 is an apocalyptic number.

1291625025 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1291625025 is a deficient number, since it is larger than the sum of its proper divisors (846720255).

1291625025 is a wasteful number, since it uses less digits than its factorization.

1291625025 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23065 (or 23060 counting only the distinct ones).

The product of its (nonzero) digits is 10800, while the sum is 33.

The square root of 1291625025 is about 35939.1850909283. The cubic root of 1291625025 is about 1089.0441428037.

Adding to 1291625025 its reverse (5205261921), we get a palindrome (6496886946).

The spelling of 1291625025 in words is "one billion, two hundred ninety-one million, six hundred twenty-five thousand, twenty-five".