61860013 has 2 divisors, whose sum is σ = 61860014. Its totient is φ = 61860012.

The previous prime is 61859971. The next prime is 61860031. The reversal of 61860013 is 31006816.

Together with next prime (61860031) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 55398249 + 6461764 = 7443^2 + 2542^2 .

It is a cyclic number.

It is not a de Polignac number, because 61860013 - 2²⁵ = 28305581 is a prime.

It is a super-2 number, since 2×61860013² = 7653322416720338, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 61860013.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (61860313) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30930006 + 30930007.

It is an arithmetic number, because the mean of its divisors is an integer number (30930007).

Almost surely, 2^61860013 is an apocalyptic number.

It is an amenable number.

61860013 is a deficient number, since it is larger than the sum of its proper divisors (1).

61860013 is an equidigital number, since it uses as much as digits as its factorization.

61860013 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 864, while the sum is 25.

The square root of 61860013 is about 7865.1136673287. The cubic root of 61860013 is about 395.4910583405.

Adding to 61860013 its reverse (31006816), we get a palindrome (92866829).

The spelling of 61860013 in words is "sixty-one million, eight hundred sixty thousand, thirteen".