61812173 has 2 divisors, whose sum is σ = 61812174. Its totient is φ = 61812172.

The previous prime is 61812169. The next prime is 61812181. The reversal of 61812173 is 37121816.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 61748164 + 64009 = 7858^2 + 253^2 .

It is a cyclic number.

It is not a de Polignac number, because 61812173 - 2² = 61812169 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (61812143) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30906086 + 30906087.

It is an arithmetic number, because the mean of its divisors is an integer number (30906087).

Almost surely, 2^61812173 is an apocalyptic number.

It is an amenable number.

61812173 is a deficient number, since it is larger than the sum of its proper divisors (1).

61812173 is an equidigital number, since it uses as much as digits as its factorization.

61812173 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2016, while the sum is 29.

The square root of 61812173 is about 7862.0718007406. The cubic root of 61812173 is about 395.3890798528.

Adding to 61812173 its reverse (37121816), we get a palindrome (98933989).

The spelling of 61812173 in words is "sixty-one million, eight hundred twelve thousand, one hundred seventy-three".