3125117261 has 4 divisors (see below), whose sum is σ = 3571562592. Its totient is φ = 2678671932.

The previous prime is 3125117243. The next prime is 3125117269. The reversal of 3125117261 is 1627115213.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 1627115213 = 487 ⋅3341099.

It is a cyclic number.

It is not a de Polignac number, because 3125117261 - 2²⁶ = 3058008397 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 (3125117269) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 223222655 + ... + 223222668.

It is an arithmetic number, because the mean of its divisors is an integer number (892890648).

Almost surely, 2^3125117261 is an apocalyptic number.

It is an amenable number.

3125117261 is a deficient number, since it is larger than the sum of its proper divisors (446445331).

3125117261 is an equidigital number, since it uses as much as digits as its factorization.

3125117261 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 446445330.

The product of its digits is 2520, while the sum is 29.

The square root of 3125117261 is about 55902.7482419246. The cubic root of 3125117261 is about 1462.0271554507.

The spelling of 3125117261 in words is "three billion, one hundred twenty-five million, one hundred seventeen thousand, two hundred sixty-one".