2931989 has 4 divisors (see below), whose sum is σ = 2936556. Its totient is φ = 2927424.

The previous prime is 2931983. The next prime is 2931997. The reversal of 2931989 is 9891392.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 339889 + 2592100 = 583^2 + 1610^2 .

It is a cyclic number.

It is not a de Polignac number, because 2931989 - 2¹⁶ = 2866453 is a prime.

It is a super-2 number, since 2×2931989² = 17193118992242, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2931983) 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, 1124 + ... + 2669.

It is an arithmetic number, because the mean of its divisors is an integer number (734139).

2^2931989 is an apocalyptic number.

It is an amenable number.

2931989 is a deficient number, since it is larger than the sum of its proper divisors (4567).

2931989 is an equidigital number, since it uses as much as digits as its factorization.

2931989 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4566.

The product of its digits is 34992, while the sum is 41.

The square root of 2931989 is about 1712.3051713991. The cubic root of 2931989 is about 143.1267398071.

The spelling of 2931989 in words is "two million, nine hundred thirty-one thousand, nine hundred eighty-nine".