3125775391 has 4 divisors (see below), whose sum is σ = 3130637272. Its totient is φ = 3120913512.

The previous prime is 3125775379. The next prime is 3125775407. The reversal of 3125775391 is 1935775213.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1935775213 = 37 ⋅52318249.

It is a cyclic number.

It is not a de Polignac number, because 3125775391 - 2¹³ = 3125767199 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 (3125775791) 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, 2429976 + ... + 2431261.

It is an arithmetic number, because the mean of its divisors is an integer number (782659318).

Almost surely, 2^3125775391 is an apocalyptic number.

3125775391 is a deficient number, since it is larger than the sum of its proper divisors (4861881).

3125775391 is an equidigital number, since it uses as much as digits as its factorization.

3125775391 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4861880.

The product of its digits is 198450, while the sum is 43.

The square root of 3125775391 is about 55908.6343152826. The cubic root of 3125775391 is about 1462.1297794820.

The spelling of 3125775391 in words is "three billion, one hundred twenty-five million, seven hundred seventy-five thousand, three hundred ninety-one".