2002991 has 8 divisors (see below), whose sum is σ = 2157840. Its totient is φ = 1852288.

The previous prime is 2002969. The next prime is 2002993. The reversal of 2002991 is 1992002.

2002991 = T₅₃ + T₅₄ + ... + T₂₂₉.

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

It is a cyclic number.

It is not a de Polignac number, because 2002991 - 2⁶ = 2002927 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2002993) 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 7 ways as a sum of consecutive naturals, for example, 5 + ... + 2001.

It is an arithmetic number, because the mean of its divisors is an integer number (269730).

2^2002991 is an apocalyptic number.

2002991 is a deficient number, since it is larger than the sum of its proper divisors (154849).

2002991 is a wasteful number, since it uses less digits than its factorization.

2002991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2073.

The product of its (nonzero) digits is 324, while the sum is 23.

The square root of 2002991 is about 1415.2706454951. The cubic root of 2002991 is about 126.0548807705.

Adding to 2002991 its reverse (1992002), we get a palindrome (3994993).

The spelling of 2002991 in words is "two million, two thousand, nine hundred ninety-one".