61939291 has 2 divisors, whose sum is σ = 61939292. Its totient is φ = 61939290.

The previous prime is 61939277. The next prime is 61939301. The reversal of 61939291 is 19293916.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-61939291 is a prime.

It is not a weakly prime, because it can be changed into another prime (61939201) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30969645 + 30969646.

It is an arithmetic number, because the mean of its divisors is an integer number (30969646).

Almost surely, 2^61939291 is an apocalyptic number.

61939291 is a deficient number, since it is larger than the sum of its proper divisors (1).

61939291 is an equidigital number, since it uses as much as digits as its factorization.

61939291 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 26244, while the sum is 40.

The square root of 61939291 is about 7870.1519045060. The cubic root of 61939291 is about 395.6599361778.

The spelling of 61939291 in words is "sixty-one million, nine hundred thirty-nine thousand, two hundred ninety-one".