61397737 has 2 divisors, whose sum is σ = 61397738. Its totient is φ = 61397736.

The previous prime is 61397719. The next prime is 61397753. The reversal of 61397737 is 73779316.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 60543961 + 853776 = 7781^2 + 924^2 .

It is a cyclic number.

It is not a de Polignac number, because 61397737 - 2¹¹ = 61395689 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 61397693 and 61397702.

It is not a weakly prime, because it can be changed into another prime (61397137) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30698868 + 30698869.

It is an arithmetic number, because the mean of its divisors is an integer number (30698869).

Almost surely, 2^61397737 is an apocalyptic number.

It is an amenable number.

61397737 is a deficient number, since it is larger than the sum of its proper divisors (1).

61397737 is an equidigital number, since it uses as much as digits as its factorization.

61397737 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 166698, while the sum is 43.

The square root of 61397737 is about 7835.6708072762. The cubic root of 61397737 is about 394.5034341247.

The spelling of 61397737 in words is "sixty-one million, three hundred ninety-seven thousand, seven hundred thirty-seven".