2001951 has 24 divisors (see below), whose sum is σ = 3386240. Its totient is φ = 1115856.

The previous prime is 2001919. The next prime is 2001953. The reversal of 2001951 is 1591002.

It is not a de Polignac number, because 2001951 - 2⁵ = 2001919 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 (2001953) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2340 + ... + 3078.

2^2001951 is an apocalyptic number.

2001951 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

2001951 is a deficient number, since it is larger than the sum of its proper divisors (1384289).

2001951 is a wasteful number, since it uses less digits than its factorization.

2001951 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 795 (or 792 counting only the distinct ones).

The product of its (nonzero) digits is 90, while the sum is 18.

The square root of 2001951 is about 1414.9031768994. The cubic root of 2001951 is about 126.0330601079.

Adding to 2001951 its reverse (1591002), we get a palindrome (3592953).

The spelling of 2001951 in words is "two million, one thousand, nine hundred fifty-one".