61689737 has 2 divisors, whose sum is σ = 61689738. Its totient is φ = 61689736.

The previous prime is 61689701. The next prime is 61689739. The reversal of 61689737 is 73798616.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 45010681 + 16679056 = 6709^2 + 4084^2 .

It is a cyclic number.

It is not a de Polignac number, because 61689737 - 2²² = 57495433 is a prime.

It is a super-2 number, since 2×61689737² = 7611247302258338, which contains 22 as substring.

Together with 61689739, it forms a pair of twin primes.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 61689691 and 61689700.

It is not a weakly prime, because it can be changed into another prime (61689739) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30844868 + 30844869.

It is an arithmetic number, because the mean of its divisors is an integer number (30844869).

Almost surely, 2^61689737 is an apocalyptic number.

It is an amenable number.

61689737 is a deficient number, since it is larger than the sum of its proper divisors (1).

61689737 is an equidigital number, since it uses as much as digits as its factorization.

61689737 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 381024, while the sum is 47.

The square root of 61689737 is about 7854.2814439005. The cubic root of 61689737 is about 395.1278483765.

It can be divided in two parts, 61689 and 737, that added together give a palindrome (62426).

The spelling of 61689737 in words is "sixty-one million, six hundred eighty-nine thousand, seven hundred thirty-seven".