61936991 has 2 divisors, whose sum is σ = 61936992. Its totient is φ = 61936990.

The previous prime is 61936951. The next prime is 61937009. The reversal of 61936991 is 19963916.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 61936991 - 2²² = 57742687 is a prime.

It is a Sophie Germain 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 (61936951) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30968495 + 30968496.

It is an arithmetic number, because the mean of its divisors is an integer number (30968496).

Almost surely, 2^61936991 is an apocalyptic number.

61936991 is a deficient number, since it is larger than the sum of its proper divisors (1).

61936991 is an equidigital number, since it uses as much as digits as its factorization.

61936991 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 78732, while the sum is 44.

The square root of 61936991 is about 7870.0057814464. The cubic root of 61936991 is about 395.6550387527.

The spelling of 61936991 in words is "sixty-one million, nine hundred thirty-six thousand, nine hundred ninety-one".