1613312421 has 16 divisors (see below), whose sum is σ = 2504767104. Its totient is φ = 904497984.

The previous prime is 1613312383. The next prime is 1613312471. The reversal of 1613312421 is 1242133161.

It is a happy number.

It is not a de Polignac number, because 1613312421 - 2⁶ = 1613312357 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1613312391 and 1613312400.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1613312471) 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, 723646 + ... + 725871.

It is an arithmetic number, because the mean of its divisors is an integer number (156547944).

Almost surely, 2^1613312421 is an apocalyptic number.

It is an amenable number.

1613312421 is a deficient number, since it is larger than the sum of its proper divisors (891454683).

1613312421 is a wasteful number, since it uses less digits than its factorization.

1613312421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1449580.

The product of its digits is 864, while the sum is 24.

The square root of 1613312421 is about 40166.0605611255. The cubic root of 1613312421 is about 1172.8419531103.

Adding to 1613312421 its reverse (1242133161), we get a palindrome (2855445582).

The spelling of 1613312421 in words is "one billion, six hundred thirteen million, three hundred twelve thousand, four hundred twenty-one".