2138651 has 4 divisors (see below), whose sum is σ = 2264472. Its totient is φ = 2012832.

The previous prime is 2138629. The next prime is 2138657. The reversal of 2138651 is 1568312.

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 2138651 - 2¹⁰ = 2137627 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 2138651.

It is not an unprimeable number, because it can be changed into a prime (2138657) 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, 62885 + ... + 62918.

It is an arithmetic number, because the mean of its divisors is an integer number (566118).

2^2138651 is an apocalyptic number.

2138651 is a deficient number, since it is larger than the sum of its proper divisors (125821).

2138651 is a wasteful number, since it uses less digits than its factorization.

2138651 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 125820.

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

The square root of 2138651 is about 1462.4127324391. The cubic root of 2138651 is about 128.8387906708.

The spelling of 2138651 in words is "two million, one hundred thirty-eight thousand, six hundred fifty-one".