61808091 has 8 divisors (see below), whose sum is σ = 82498560. Its totient is φ = 41161512.

The previous prime is 61808063. The next prime is 61808101. The reversal of 61808091 is 19080816.

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

It is not a de Polignac number, because 61808091 - 2⁵ = 61808059 is a prime.

It is a super-2 number, since 2×61808091² = 7640480226128562, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (61808011) 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, 7531 + ... + 13428.

It is an arithmetic number, because the mean of its divisors is an integer number (10312320).

Almost surely, 2^61808091 is an apocalyptic number.

61808091 is a deficient number, since it is larger than the sum of its proper divisors (20690469).

61808091 is a wasteful number, since it uses less digits than its factorization.

61808091 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21945.

The product of its (nonzero) digits is 3456, while the sum is 33.

The square root of 61808091 is about 7861.8121956709. The cubic root of 61808091 is about 395.3803759914.

The spelling of 61808091 in words is "sixty-one million, eight hundred eight thousand, ninety-one".