989992061 has 4 divisors (see below), whose sum is σ = 990640224. Its totient is φ = 989343900.

The previous prime is 989992057. The next prime is 989992063. The reversal of 989992061 is 160299989.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 989992061 - 2² = 989992057 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 989991994 and 989992012.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (989992063) 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, 321785 + ... + 324846.

It is an arithmetic number, because the mean of its divisors is an integer number (247660056).

Almost surely, 2^989992061 is an apocalyptic number.

It is an amenable number.

989992061 is a deficient number, since it is larger than the sum of its proper divisors (648163).

989992061 is a wasteful number, since it uses less digits than its factorization.

989992061 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 648162.

The product of its (nonzero) digits is 629856, while the sum is 53.

The square root of 989992061 is about 31464.1392858600. The cubic root of 989992061 is about 996.6528292816.

The spelling of 989992061 in words is "nine hundred eighty-nine million, nine hundred ninety-two thousand, sixty-one".