2051931 has 8 divisors (see below), whose sum is σ = 3126784. Its totient is φ = 1172520.

The previous prime is 2051923. The next prime is 2051947. The reversal of 2051931 is 1391502.

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

It is not a de Polignac number, because 2051931 - 2³ = 2051923 is a prime.

It is a super-2 number, since 2×2051931² = 8420841657522, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (21), and also a Moran number because the ratio is a prime number: 97711 = 2051931 / (2 + 0 + 5 + 1 + 9 + 3 + 1).

It is a Duffinian number.

2051931 is a lucky number.

It is a junction number, because it is equal to n+sod(n) for n = 2051898 and 2051907.

It is not an unprimeable number, because it can be changed into a prime (2059931) 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, 48835 + ... + 48876.

It is an arithmetic number, because the mean of its divisors is an integer number (390848).

2^2051931 is an apocalyptic number.

2051931 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

2051931 is a deficient number, since it is larger than the sum of its proper divisors (1074853).

2051931 is an equidigital number, since it uses as much as digits as its factorization.

2051931 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 97721.

The product of its (nonzero) digits is 270, while the sum is 21.

The square root of 2051931 is about 1432.4562820554. The cubic root of 2051931 is about 127.0732831850.

The spelling of 2051931 in words is "two million, fifty-one thousand, nine hundred thirty-one".