1613225231 has 4 divisors (see below), whose sum is σ = 1613443152. Its totient is φ = 1613007312.

The previous prime is 1613225209. The next prime is 1613225287. The reversal of 1613225231 is 1325223161.

It is a happy number.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1613225231 is a prime.

It is a super-2 number, since 2×1613225231² = 5204991291870006722, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1613225231.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1613225291) 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, 97451 + ... + 112796.

It is an arithmetic number, because the mean of its divisors is an integer number (403360788).

Almost surely, 2^1613225231 is an apocalyptic number.

1613225231 is a deficient number, since it is larger than the sum of its proper divisors (217921).

1613225231 is an equidigital number, since it uses as much as digits as its factorization.

1613225231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 217920.

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

The square root of 1613225231 is about 40164.9751773856. The cubic root of 1613225231 is about 1172.8208243381.

Adding to 1613225231 its reverse (1325223161), we get a palindrome (2938448392).

The spelling of 1613225231 in words is "one billion, six hundred thirteen million, two hundred twenty-five thousand, two hundred thirty-one".