1613501321 has 2 divisors, whose sum is σ = 1613501322. Its totient is φ = 1613501320.

The previous prime is 1613501311. The next prime is 1613501327. The reversal of 1613501321 is 1231053161.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 855270025 + 758231296 = 29245^2 + 27536^2 .

It is a cyclic number.

It is not a de Polignac number, because 1613501321 - 2²² = 1609307017 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (1613501327) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 806750660 + 806750661.

It is an arithmetic number, because the mean of its divisors is an integer number (806750661).

Almost surely, 2^1613501321 is an apocalyptic number.

It is an amenable number.

1613501321 is a deficient number, since it is larger than the sum of its proper divisors (1).

1613501321 is an equidigital number, since it uses as much as digits as its factorization.

1613501321 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 540, while the sum is 23.

The square root of 1613501321 is about 40168.4119800621. The cubic root of 1613501321 is about 1172.8877266786.

Adding to 1613501321 its reverse (1231053161), we get a palindrome (2844554482).

The spelling of 1613501321 in words is "one billion, six hundred thirteen million, five hundred one thousand, three hundred twenty-one".