2501381 has 4 divisors (see below), whose sum is σ = 2511372. Its totient is φ = 2491392.

The previous prime is 2501357. The next prime is 2501383. The reversal of 2501381 is 1831052.

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 2353156 + 148225 = 1534^2 + 385^2 .

It is a cyclic number.

It is not a de Polignac number, because 2501381 - 2¹⁰ = 2500357 is a prime.

It is a super-2 number, since 2×2501381² = 12513813814322, which contains 22 as substring.

It is an Ulam number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2501383) 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, 4610 + ... + 5123.

It is an arithmetic number, because the mean of its divisors is an integer number (627843).

2^2501381 is an apocalyptic number.

It is an amenable number.

2501381 is a deficient number, since it is larger than the sum of its proper divisors (9991).

2501381 is an equidigital number, since it uses as much as digits as its factorization.

2501381 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9990.

The product of its (nonzero) digits is 240, while the sum is 20.

The square root of 2501381 is about 1581.5754803360. The cubic root of 2501381 is about 135.7458669677.

It can be divided in two parts, 2501 and 381, that added together give a palindrome (2882).

The spelling of 2501381 in words is "two million, five hundred one thousand, three hundred eighty-one".