61431566 has 8 divisors (see below), whose sum is σ = 105311280. Its totient is φ = 26327808.

The previous prime is 61431529. The next prime is 61431583. The reversal of 61431566 is 66513416.

It is a sphenic number, since it is the product of 3 distinct primes.

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 3 ways as a sum of consecutive naturals, for example, 2193971 + ... + 2193998.

It is an arithmetic number, because the mean of its divisors is an integer number (13163910).

Almost surely, 2^61431566 is an apocalyptic number.

61431566 is a deficient number, since it is larger than the sum of its proper divisors (43879714).

61431566 is a wasteful number, since it uses less digits than its factorization.

61431566 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4387978.

The product of its digits is 12960, while the sum is 32.

The square root of 61431566 is about 7837.8291637417. The cubic root of 61431566 is about 394.5758754828.

The spelling of 61431566 in words is "sixty-one million, four hundred thirty-one thousand, five hundred sixty-six".