61137997 has 2 divisors, whose sum is σ = 61137998. Its totient is φ = 61137996.

The previous prime is 61137971. The next prime is 61138039. The reversal of 61137997 is 79973116.

61137997 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 56836521 + 4301476 = 7539^2 + 2074^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-61137997 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (61137397) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30568998 + 30568999.

It is an arithmetic number, because the mean of its divisors is an integer number (30568999).

Almost surely, 2^61137997 is an apocalyptic number.

It is an amenable number.

61137997 is a deficient number, since it is larger than the sum of its proper divisors (1).

61137997 is an equidigital number, since it uses as much as digits as its factorization.

61137997 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 71442, while the sum is 43.

The square root of 61137997 is about 7819.0790378407. The cubic root of 61137997 is about 393.9463389003.

The spelling of 61137997 in words is "sixty-one million, one hundred thirty-seven thousand, nine hundred ninety-seven".