61822991 has 2 divisors, whose sum is σ = 61822992. Its totient is φ = 61822990.

The previous prime is 61822939. The next prime is 61822993. The reversal of 61822991 is 19922816.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 61822991 - 2²² = 57628687 is a prime.

Together with 61822993, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (61822993) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30911495 + 30911496.

It is an arithmetic number, because the mean of its divisors is an integer number (30911496).

Almost surely, 2^61822991 is an apocalyptic number.

61822991 is a deficient number, since it is larger than the sum of its proper divisors (1).

61822991 is an equidigital number, since it uses as much as digits as its factorization.

61822991 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 15552, while the sum is 38.

The square root of 61822991 is about 7862.7597572354. The cubic root of 61822991 is about 395.4121447247.

The spelling of 61822991 in words is "sixty-one million, eight hundred twenty-two thousand, nine hundred ninety-one".