61320013 has 4 divisors (see below), whose sum is σ = 61336060. Its totient is φ = 61303968.

The previous prime is 61319981. The next prime is 61320019. The reversal of 61320013 is 31002316.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 44649124 + 16670889 = 6682^2 + 4083^2 .

It is a cyclic number.

It is not a de Polignac number, because 61320013 - 2⁵ = 61319981 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61320019) 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, 1393 + ... + 11161.

It is an arithmetic number, because the mean of its divisors is an integer number (15334015).

Almost surely, 2^61320013 is an apocalyptic number.

It is an amenable number.

61320013 is a deficient number, since it is larger than the sum of its proper divisors (16047).

61320013 is an equidigital number, since it uses as much as digits as its factorization.

61320013 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16046.

The product of its (nonzero) digits is 108, while the sum is 16.

The square root of 61320013 is about 7830.7096102461. The cubic root of 61320013 is about 394.3368952362.

Adding to 61320013 its reverse (31002316), we get a palindrome (92322329).

The spelling of 61320013 in words is "sixty-one million, three hundred twenty thousand, thirteen".