9819890061 has 8 divisors (see below), whose sum is σ = 13782301920. Its totient is φ = 6202035792.

The previous prime is 9819890051. The next prime is 9819890123. The reversal of 9819890061 is 1600989189.

It is a happy number.

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

It is not a de Polignac number, because 9819890061 - 2²¹ = 9817792909 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 9819889986 and 9819890013.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9819890051) 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, 86139330 + ... + 86139443.

It is an arithmetic number, because the mean of its divisors is an integer number (1722787740).

Almost surely, 2^9819890061 is an apocalyptic number.

It is an amenable number.

9819890061 is a deficient number, since it is larger than the sum of its proper divisors (3962411859).

9819890061 is a wasteful number, since it uses less digits than its factorization.

9819890061 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 172278795.

The product of its (nonzero) digits is 279936, while the sum is 51.

The square root of 9819890061 is about 99095.3584230866. The cubic root of 9819890061 is about 2141.4217457848.

The spelling of 9819890061 in words is "nine billion, eight hundred nineteen million, eight hundred ninety thousand, sixty-one".