1613451121 has 4 divisors (see below), whose sum is σ = 1613609332. Its totient is φ = 1613292912.

The previous prime is 1613451107. The next prime is 1613451143. The reversal of 1613451121 is 1211543161.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1211543161 = 28201 ⋅42961.

It can be written as a sum of positive squares in 2 ways, for example, as 549386721 + 1064064400 = 23439^2 + 32620^2 .

It is a cyclic number.

It is not a de Polignac number, because 1613451121 - 2⁵ = 1613451089 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1613451821) 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, 62670 + ... + 84583.

It is an arithmetic number, because the mean of its divisors is an integer number (403402333).

Almost surely, 2^1613451121 is an apocalyptic number.

It is an amenable number.

1613451121 is a deficient number, since it is larger than the sum of its proper divisors (158211).

1613451121 is a wasteful number, since it uses less digits than its factorization.

1613451121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 158210.

The product of its digits is 720, while the sum is 25.

The square root of 1613451121 is about 40167.7871060879. The cubic root of 1613451121 is about 1172.8755627438.

Adding to 1613451121 its reverse (1211543161), we get a palindrome (2824994282).

The spelling of 1613451121 in words is "one billion, six hundred thirteen million, four hundred fifty-one thousand, one hundred twenty-one".