61990989 has 8 divisors (see below), whose sum is σ = 82704000. Its totient is φ = 41302656.

The previous prime is 61990967. The next prime is 61990997. The reversal of 61990989 is 98909916.

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

It is not a de Polignac number, because 61990989 - 2¹⁹ = 61466701 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61990949) 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, 829 + ... + 11165.

It is an arithmetic number, because the mean of its divisors is an integer number (10338000).

Almost surely, 2^61990989 is an apocalyptic number.

It is an amenable number.

61990989 is a deficient number, since it is larger than the sum of its proper divisors (20713011).

61990989 is a wasteful number, since it uses less digits than its factorization.

61990989 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12339.

The product of its (nonzero) digits is 314928, while the sum is 51.

The square root of 61990989 is about 7873.4356541474. The cubic root of 61990989 is about 395.7699855437.

The spelling of 61990989 in words is "sixty-one million, nine hundred ninety thousand, nine hundred eighty-nine".