2115751 has 4 divisors (see below), whose sum is σ = 2308104. Its totient is φ = 1923400.

The previous prime is 2115749. The next prime is 2115761. The reversal of 2115751 is 1575112.

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 2115751 - 2¹ = 2115749 is a prime.

It is a Smith number, since the sum of its digits (22) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax 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 (2115721) 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, 96160 + ... + 96181.

It is an arithmetic number, because the mean of its divisors is an integer number (577026).

2^2115751 is an apocalyptic number.

2115751 is the 651-st centered decagonal number.

2115751 is a deficient number, since it is larger than the sum of its proper divisors (192353).

2115751 is a wasteful number, since it uses less digits than its factorization.

2115751 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 192352.

The product of its digits is 350, while the sum is 22.

The square root of 2115751 is about 1454.5621334271. The cubic root of 2115751 is about 128.3772844719.

The spelling of 2115751 in words is "two million, one hundred fifteen thousand, seven hundred fifty-one".