61291685 has 16 divisors (see below), whose sum is σ = 90523776. Its totient is φ = 38795328.

The previous prime is 61291669. The next prime is 61291687. The reversal of 61291685 is 58619216.

It is not a de Polignac number, because 61291685 - 2⁴ = 61291669 is a prime.

It is a Smith number, since the sum of its digits (38) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61291687) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 66899 + ... + 67808.

It is an arithmetic number, because the mean of its divisors is an integer number (5657736).

Almost surely, 2^61291685 is an apocalyptic number.

61291685 is a gapful number since it is divisible by the number (65) formed by its first and last digit.

It is an amenable number.

61291685 is a deficient number, since it is larger than the sum of its proper divisors (29232091).

61291685 is a wasteful number, since it uses less digits than its factorization.

61291685 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 134732.

The product of its digits is 25920, while the sum is 38.

The square root of 61291685 is about 7828.9006252475. The cubic root of 61291685 is about 394.2761619581.

The spelling of 61291685 in words is "sixty-one million, two hundred ninety-one thousand, six hundred eighty-five".