61930891 has 8 divisors (see below), whose sum is σ = 67866624. Its totient is φ = 56046120.

The previous prime is 61930849. The next prime is 61930903. The reversal of 61930891 is 19803916.

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

It is a cyclic number.

It is not a de Polignac number, because 61930891 - 2⁷ = 61930763 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 61930891.

It is not an unprimeable number, because it can be changed into a prime (61930801) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10171 + ... + 15076.

It is an arithmetic number, because the mean of its divisors is an integer number (8483328).

Almost surely, 2^61930891 is an apocalyptic number.

61930891 is a deficient number, since it is larger than the sum of its proper divisors (5935733).

61930891 is a wasteful number, since it uses less digits than its factorization.

61930891 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25481.

The product of its (nonzero) digits is 11664, while the sum is 37.

The square root of 61930891 is about 7869.6182245392. The cubic root of 61930891 is about 395.6420493423.

The spelling of 61930891 in words is "sixty-one million, nine hundred thirty thousand, eight hundred ninety-one".