2651381 has 4 divisors (see below), whose sum is σ = 2657100. Its totient is φ = 2645664.

The previous prime is 2651377. The next prime is 2651387. The reversal of 2651381 is 1831562.

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 2430481 + 220900 = 1559^2 + 470^2 .

It is a cyclic number.

It is not a de Polignac number, because 2651381 - 2² = 2651377 is a prime.

It is a super-2 number, since 2×2651381² = 14059642414322, which contains 22 as substring.

It is an Ulam number.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 2651381.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2651387) 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, 2096 + ... + 3113.

It is an arithmetic number, because the mean of its divisors is an integer number (664275).

2^2651381 is an apocalyptic number.

It is an amenable number.

2651381 is a deficient number, since it is larger than the sum of its proper divisors (5719).

2651381 is an equidigital number, since it uses as much as digits as its factorization.

2651381 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5718.

The product of its digits is 1440, while the sum is 26.

The square root of 2651381 is about 1628.3061751403. The cubic root of 2651381 is about 138.4067847532.

The spelling of 2651381 in words is "two million, six hundred fifty-one thousand, three hundred eighty-one".