61313191 has 2 divisors, whose sum is σ = 61313192. Its totient is φ = 61313190.

The previous prime is 61313173. The next prime is 61313201. The reversal of 61313191 is 19131316.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 61313191 - 2⁵ = 61313159 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (61319191) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30656595 + 30656596.

It is an arithmetic number, because the mean of its divisors is an integer number (30656596).

Almost surely, 2^61313191 is an apocalyptic number.

61313191 is a deficient number, since it is larger than the sum of its proper divisors (1).

61313191 is an equidigital number, since it uses as much as digits as its factorization.

61313191 is an evil number, because the sum of its binary digits is even.

The product of its digits is 486, while the sum is 25.

The square root of 61313191 is about 7830.2740054228. The cubic root of 61313191 is about 394.3222710489.

It can be divided in two parts, 61313 and 191, that added together give a square (61504 = 248²).

The spelling of 61313191 in words is "sixty-one million, three hundred thirteen thousand, one hundred ninety-one".