1261363625 has 16 divisors (see below), whose sum is σ = 1591883280. Its totient is φ = 997744000.

The previous prime is 1261363567. The next prime is 1261363627. The reversal of 1261363625 is 5263631621.

It can be written as a sum of positive squares in 8 ways, for example, as 268861609 + 992502016 = 16397^2 + 31504^2 .

It is not a de Polignac number, because 1261363625 - 2⁶ = 1261363561 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1261363627) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 45566 + ... + 67815.

It is an arithmetic number, because the mean of its divisors is an integer number (99492705).

Almost surely, 2^1261363625 is an apocalyptic number.

It is an amenable number.

1261363625 is a deficient number, since it is larger than the sum of its proper divisors (330519655).

1261363625 is an equidigital number, since it uses as much as digits as its factorization.

1261363625 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 113485 (or 113475 counting only the distinct ones).

The product of its digits is 38880, while the sum is 35.

The square root of 1261363625 is about 35515.6813956877. The cubic root of 1261363625 is about 1080.4717946110.

The spelling of 1261363625 in words is "one billion, two hundred sixty-one million, three hundred sixty-three thousand, six hundred twenty-five".