61684417 has 2 divisors, whose sum is σ = 61684418. Its totient is φ = 61684416.

The previous prime is 61684349. The next prime is 61684423. The reversal of 61684417 is 71448616.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 54154881 + 7529536 = 7359^2 + 2744^2 .

It is a cyclic number.

It is not a de Polignac number, because 61684417 - 2¹⁵ = 61651649 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (61684487) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30842208 + 30842209.

It is an arithmetic number, because the mean of its divisors is an integer number (30842209).

Almost surely, 2^61684417 is an apocalyptic number.

It is an amenable number.

61684417 is a deficient number, since it is larger than the sum of its proper divisors (1).

61684417 is an equidigital number, since it uses as much as digits as its factorization.

61684417 is an evil number, because the sum of its binary digits is even.

The product of its digits is 32256, while the sum is 37.

The square root of 61684417 is about 7853.9427678078. The cubic root of 61684417 is about 395.1164897039.

It can be divided in two parts, 6168 and 4417, that added together give a triangular number (10585 = T₁₄₅).

The spelling of 61684417 in words is "sixty-one million, six hundred eighty-four thousand, four hundred seventeen".