61913213 has 2 divisors, whose sum is σ = 61913214. Its totient is φ = 61913212.

The previous prime is 61913209. The next prime is 61913221. The reversal of 61913213 is 31231916.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 44382244 + 17530969 = 6662^2 + 4187^2 .

It is a cyclic number.

It is not a de Polignac number, because 61913213 - 2² = 61913209 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (61913113) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30956606 + 30956607.

It is an arithmetic number, because the mean of its divisors is an integer number (30956607).

Almost surely, 2^61913213 is an apocalyptic number.

It is an amenable number.

61913213 is a deficient number, since it is larger than the sum of its proper divisors (1).

61913213 is an equidigital number, since it uses as much as digits as its factorization.

61913213 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 972, while the sum is 26.

The square root of 61913213 is about 7868.4949640957. The cubic root of 61913213 is about 395.6044007869.

It can be divided in two parts, 61913 and 213, that added together give a palindrome (62126).

The spelling of 61913213 in words is "sixty-one million, nine hundred thirteen thousand, two hundred thirteen".