61985173 has 2 divisors, whose sum is σ = 61985174. Its totient is φ = 61985172.

The previous prime is 61985137. The next prime is 61985191. The reversal of 61985173 is 37158916.

Together with previous prime (61985137) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 61826769 + 158404 = 7863^2 + 398^2 .

It is a cyclic number.

It is not a de Polignac number, because 61985173 - 2²⁵ = 28430741 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (61985113) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30992586 + 30992587.

It is an arithmetic number, because the mean of its divisors is an integer number (30992587).

Almost surely, 2^61985173 is an apocalyptic number.

It is an amenable number.

61985173 is a deficient number, since it is larger than the sum of its proper divisors (1).

61985173 is an equidigital number, since it uses as much as digits as its factorization.

61985173 is an evil number, because the sum of its binary digits is even.

The product of its digits is 45360, while the sum is 40.

The square root of 61985173 is about 7873.0663022738. The cubic root of 61985173 is about 395.7576080984.

The spelling of 61985173 in words is "sixty-one million, nine hundred eighty-five thousand, one hundred seventy-three".