61826591 has 2 divisors, whose sum is σ = 61826592. Its totient is φ = 61826590.

The previous prime is 61826543. The next prime is 61826651. The reversal of 61826591 is 19562816.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-61826591 is a prime.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (61823591) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30913295 + 30913296.

It is an arithmetic number, because the mean of its divisors is an integer number (30913296).

Almost surely, 2^61826591 is an apocalyptic number.

61826591 is a deficient number, since it is larger than the sum of its proper divisors (1).

61826591 is an equidigital number, since it uses as much as digits as its factorization.

61826591 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 25920, while the sum is 38.

The square root of 61826591 is about 7862.9886811568. The cubic root of 61826591 is about 395.4198196262.

The spelling of 61826591 in words is "sixty-one million, eight hundred twenty-six thousand, five hundred ninety-one".