61972291 has 2 divisors, whose sum is σ = 61972292. Its totient is φ = 61972290.

The previous prime is 61972289. The next prime is 61972297. The reversal of 61972291 is 19227916.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 61972291 - 2¹ = 61972289 is a prime.

Together with 61972289, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 61972291.

It is not a weakly prime, because it can be changed into another prime (61972297) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30986145 + 30986146.

It is an arithmetic number, because the mean of its divisors is an integer number (30986146).

Almost surely, 2^61972291 is an apocalyptic number.

61972291 is a deficient number, since it is larger than the sum of its proper divisors (1).

61972291 is an equidigital number, since it uses as much as digits as its factorization.

61972291 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 13608, while the sum is 37.

The square root of 61972291 is about 7872.2481541171. The cubic root of 61972291 is about 395.7301902366.

The spelling of 61972291 in words is "sixty-one million, nine hundred seventy-two thousand, two hundred ninety-one".