61431686 has 12 divisors (see below), whose sum is σ = 95437212. Its totient is φ = 29655864.

The previous prime is 61431661. The next prime is 61431691. The reversal of 61431686 is 68613416.

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 5 ways as a sum of consecutive naturals, for example, 16580 + ... + 19943.

It is an arithmetic number, because the mean of its divisors is an integer number (7953101).

Almost surely, 2^61431686 is an apocalyptic number.

61431686 is the 4190-th centered heptagonal number.

61431686 is a deficient number, since it is larger than the sum of its proper divisors (34005526).

61431686 is a wasteful number, since it uses less digits than its factorization.

61431686 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36583 (or 36554 counting only the distinct ones).

The product of its digits is 20736, while the sum is 35.

The square root of 61431686 is about 7837.8368189189. The cubic root of 61431686 is about 394.5761324032.

The spelling of 61431686 in words is "sixty-one million, four hundred thirty-one thousand, six hundred eighty-six".