61117391 has 2 divisors, whose sum is σ = 61117392. Its totient is φ = 61117390.

The previous prime is 61117369. The next prime is 61117411. The reversal of 61117391 is 19371116.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-61117391 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (61117351) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30558695 + 30558696.

It is an arithmetic number, because the mean of its divisors is an integer number (30558696).

Almost surely, 2^61117391 is an apocalyptic number.

61117391 is a deficient number, since it is larger than the sum of its proper divisors (1).

61117391 is an equidigital number, since it uses as much as digits as its factorization.

61117391 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1134, while the sum is 29.

The square root of 61117391 is about 7817.7612524303. The cubic root of 61117391 is about 393.9020752627.

The spelling of 61117391 in words is "sixty-one million, one hundred seventeen thousand, three hundred ninety-one".