1625220413 has 4 divisors (see below), whose sum is σ = 1625570688. Its totient is φ = 1624870140.

The previous prime is 1625220409. The next prime is 1625220419. The reversal of 1625220413 is 3140225261.

It is a happy number.

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.

It is a cyclic number.

It is not a de Polignac number, because 1625220413 - 2² = 1625220409 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 (1625220419) 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, 168083 + ... + 177488.

It is an arithmetic number, because the mean of its divisors is an integer number (406392672).

Almost surely, 2^1625220413 is an apocalyptic number.

It is an amenable number.

1625220413 is a deficient number, since it is larger than the sum of its proper divisors (350275).

1625220413 is an equidigital number, since it uses as much as digits as its factorization.

1625220413 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 350274.

The product of its (nonzero) digits is 2880, while the sum is 26.

The square root of 1625220413 is about 40314.0225355893. The cubic root of 1625220413 is about 1175.7204968144.

Adding to 1625220413 its reverse (3140225261), we get a palindrome (4765445674).

The spelling of 1625220413 in words is "one billion, six hundred twenty-five million, two hundred twenty thousand, four hundred thirteen".