61181990 has 8 divisors (see below), whose sum is σ = 110127600. Its totient is φ = 24472792.

The previous prime is 61181987. The next prime is 61181993. The reversal of 61181990 is 9918116.

It is an interprime number because it is at equal distance from previous prime (61181987) and next prime (61181993).

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

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 61181990.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61181993) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3059090 + ... + 3059109.

It is an arithmetic number, because the mean of its divisors is an integer number (13765950).

Almost surely, 2^61181990 is an apocalyptic number.

61181990 is a deficient number, since it is larger than the sum of its proper divisors (48945610).

61181990 is a wasteful number, since it uses less digits than its factorization.

61181990 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6118206.

The product of its (nonzero) digits is 3888, while the sum is 35.

The square root of 61181990 is about 7821.8917149242. The cubic root of 61181990 is about 394.0408067538.

The spelling of 61181990 in words is "sixty-one million, one hundred eighty-one thousand, nine hundred ninety".