61191413 has 2 divisors, whose sum is σ = 61191414. Its totient is φ = 61191412.

The previous prime is 61191407. The next prime is 61191439. The reversal of 61191413 is 31419116.

It is an a-pointer prime, because the next prime (61191439) can be obtained adding 61191413 to its sum of digits (26).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 58874929 + 2316484 = 7673^2 + 1522^2 .

It is a cyclic number.

It is not a de Polignac number, because 61191413 - 2⁶ = 61191349 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (61193413) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30595706 + 30595707.

It is an arithmetic number, because the mean of its divisors is an integer number (30595707).

Almost surely, 2^61191413 is an apocalyptic number.

It is an amenable number.

61191413 is a deficient number, since it is larger than the sum of its proper divisors (1).

61191413 is an equidigital number, since it uses as much as digits as its factorization.

61191413 is an evil number, because the sum of its binary digits is even.

The product of its digits is 648, while the sum is 26.

The square root of 61191413 is about 7822.4940396270. The cubic root of 61191413 is about 394.0610352334.

The spelling of 61191413 in words is "sixty-one million, one hundred ninety-one thousand, four hundred thirteen".