2138951 has 4 divisors (see below), whose sum is σ = 2143152. Its totient is φ = 2134752.

The previous prime is 2138909. The next prime is 2138971. The reversal of 2138951 is 1598312.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 2138951 - 2¹⁸ = 1876807 is a prime.

It is a super-2 number, since 2×2138951² = 9150222760802, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2138971) 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, 1211 + ... + 2396.

It is an arithmetic number, because the mean of its divisors is an integer number (535788).

2^2138951 is an apocalyptic number.

2138951 is a deficient number, since it is larger than the sum of its proper divisors (4201).

2138951 is an equidigital number, since it uses as much as digits as its factorization.

2138951 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4200.

The product of its digits is 2160, while the sum is 29.

The square root of 2138951 is about 1462.5152990653. The cubic root of 2138951 is about 128.8448146910.

The spelling of 2138951 in words is "two million, one hundred thirty-eight thousand, nine hundred fifty-one".