61972289 has 2 divisors, whose sum is σ = 61972290. Its totient is φ = 61972288.

The previous prime is 61972271. The next prime is 61972291. The reversal of 61972289 is 98227916.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 46036225 + 15936064 = 6785^2 + 3992^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-61972289 is a prime.

Together with 61972291, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (61972219) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30986144 + 30986145.

It is an arithmetic number, because the mean of its divisors is an integer number (30986145).

Almost surely, 2^61972289 is an apocalyptic number.

It is an amenable number.

61972289 is a deficient number, since it is larger than the sum of its proper divisors (1).

61972289 is an equidigital number, since it uses as much as digits as its factorization.

61972289 is an evil number, because the sum of its binary digits is even.

The product of its digits is 108864, while the sum is 44.

The square root of 61972289 is about 7872.2480270886. The cubic root of 61972289 is about 395.7301859796.

The spelling of 61972289 in words is "sixty-one million, nine hundred seventy-two thousand, two hundred eighty-nine".