61801605 has 12 divisors (see below), whose sum is σ = 107122860. Its totient is φ = 32960832.

The previous prime is 61801591. The next prime is 61801627. The reversal of 61801605 is 50610816.

It can be written as a sum of positive squares in 2 ways, for example, as 6937956 + 54863649 = 2634^2 + 7407^2 .

It is not a de Polignac number, because 61801605 - 2⁴ = 61801589 is a prime.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 686640 + ... + 686729.

It is an arithmetic number, because the mean of its divisors is an integer number (8926905).

Almost surely, 2^61801605 is an apocalyptic number.

It is an amenable number.

61801605 is a deficient number, since it is larger than the sum of its proper divisors (45321255).

61801605 is a wasteful number, since it uses less digits than its factorization.

61801605 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1373380 (or 1373377 counting only the distinct ones).

The product of its (nonzero) digits is 1440, while the sum is 27.

The square root of 61801605 is about 7861.3996845346. The cubic root of 61801605 is about 395.3665454029.

The spelling of 61801605 in words is "sixty-one million, eight hundred one thousand, six hundred five".