61916187 has 4 divisors (see below), whose sum is σ = 82554920. Its totient is φ = 41277456.

The previous prime is 61916177. The next prime is 61916201. The reversal of 61916187 is 78161916.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 61916187 - 2¹⁰ = 61915163 is a prime.

It is a super-2 number, since 2×61916187² = 7667228425237938, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (61916147) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10319362 + ... + 10319367.

It is an arithmetic number, because the mean of its divisors is an integer number (20638730).

Almost surely, 2^61916187 is an apocalyptic number.

61916187 is a deficient number, since it is larger than the sum of its proper divisors (20638733).

61916187 is a wasteful number, since it uses less digits than its factorization.

61916187 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20638732.

The product of its digits is 18144, while the sum is 39.

The square root of 61916187 is about 7868.6839433288. The cubic root of 61916187 is about 395.6107349688.

The spelling of 61916187 in words is "sixty-one million, nine hundred sixteen thousand, one hundred eighty-seven".