61240391 has 2 divisors, whose sum is σ = 61240392. Its totient is φ = 61240390.

The previous prime is 61240381. The next prime is 61240397. The reversal of 61240391 is 19304216.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 61240391 - 2⁶ = 61240327 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 61240391.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (61240397) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30620195 + 30620196.

It is an arithmetic number, because the mean of its divisors is an integer number (30620196).

Almost surely, 2^61240391 is an apocalyptic number.

61240391 is a deficient number, since it is larger than the sum of its proper divisors (1).

61240391 is an equidigital number, since it uses as much as digits as its factorization.

61240391 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1296, while the sum is 26.

The square root of 61240391 is about 7825.6240006788. The cubic root of 61240391 is about 394.1661435231.

The spelling of 61240391 in words is "sixty-one million, two hundred forty thousand, three hundred ninety-one".