3125312621 has 4 divisors (see below), whose sum is σ = 3125573244. Its totient is φ = 3125052000.

The previous prime is 3125312587. The next prime is 3125312653. The reversal of 3125312621 is 1262135213.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1976780521 + 1148532100 = 44461^2 + 33890^2 .

It is a cyclic number.

It is not a de Polignac number, because 3125312621 - 2¹⁸ = 3125050477 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 (3125312221) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 111410 + ... + 136611.

It is an arithmetic number, because the mean of its divisors is an integer number (781393311).

Almost surely, 2^3125312621 is an apocalyptic number.

It is an amenable number.

3125312621 is a deficient number, since it is larger than the sum of its proper divisors (260623).

3125312621 is a wasteful number, since it uses less digits than its factorization.

3125312621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 260622.

The product of its digits is 2160, while the sum is 26.

The square root of 3125312621 is about 55904.4955347958. The cubic root of 3125312621 is about 1462.0576199794.

Adding to 3125312621 its reverse (1262135213), we get a palindrome (4387447834).

The spelling of 3125312621 in words is "three billion, one hundred twenty-five million, three hundred twelve thousand, six hundred twenty-one".