61885791 has 12 divisors (see below), whose sum is σ = 97517160. Its totient is φ = 37506480.

The previous prime is 61885787. The next prime is 61885829. The reversal of 61885791 is 19758816.

It is not a de Polignac number, because 61885791 - 2² = 61885787 is a prime.

It is a super-2 number, since 2×61885791² = 7659702255391362, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61885711) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 312456 + ... + 312653.

It is an arithmetic number, because the mean of its divisors is an integer number (8126430).

Almost surely, 2^61885791 is an apocalyptic number.

61885791 is a deficient number, since it is larger than the sum of its proper divisors (35631369).

61885791 is a wasteful number, since it uses less digits than its factorization.

61885791 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 625126 (or 625123 counting only the distinct ones).

The product of its digits is 120960, while the sum is 45.

The square root of 61885791 is about 7866.7522523593. The cubic root of 61885791 is about 395.5459864068.

The spelling of 61885791 in words is "sixty-one million, eight hundred eighty-five thousand, seven hundred ninety-one".