1613213121 has 16 divisors (see below), whose sum is σ = 2322541760. Its totient is φ = 990118080.

The previous prime is 1613213117. The next prime is 1613213143. The reversal of 1613213121 is 1213123161.

It is not a de Polignac number, because 1613213121 - 2² = 1613213117 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1613213321) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 39790 + ... + 69351.

It is an arithmetic number, because the mean of its divisors is an integer number (145158860).

Almost surely, 2^1613213121 is an apocalyptic number.

It is an amenable number.

1613213121 is a deficient number, since it is larger than the sum of its proper divisors (709328639).

1613213121 is a wasteful number, since it uses less digits than its factorization.

1613213121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 109536.

The product of its digits is 216, while the sum is 21.

The square root of 1613213121 is about 40164.8244238662. The cubic root of 1613213121 is about 1172.8178896589.

Adding to 1613213121 its reverse (1213123161), we get a palindrome (2826336282).

The spelling of 1613213121 in words is "one billion, six hundred thirteen million, two hundred thirteen thousand, one hundred twenty-one".