61840591 has 2 divisors, whose sum is σ = 61840592. Its totient is φ = 61840590.

The previous prime is 61840589. The next prime is 61840657. The reversal of 61840591 is 19504816.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 61840591 - 2¹ = 61840589 is a prime.

Together with 61840589, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (61840501) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30920295 + 30920296.

It is an arithmetic number, because the mean of its divisors is an integer number (30920296).

Almost surely, 2^61840591 is an apocalyptic number.

61840591 is a deficient number, since it is larger than the sum of its proper divisors (1).

61840591 is an equidigital number, since it uses as much as digits as its factorization.

61840591 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 8640, while the sum is 34.

The square root of 61840591 is about 7863.8788775006. The cubic root of 61840591 is about 395.4496636333.

It can be divided in two parts, 618 and 40591, that added together give a square (41209 = 203²).

The spelling of 61840591 in words is "sixty-one million, eight hundred forty thousand, five hundred ninety-one".