2145251 has 4 divisors (see below), whose sum is σ = 2174712. Its totient is φ = 2115792.

The previous prime is 2145239. The next prime is 2145263. The reversal of 2145251 is 1525412.

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

It is an interprime number because it is at equal distance from previous prime (2145239) and next prime (2145263).

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2145251 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2145151) 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, 14621 + ... + 14766.

It is an arithmetic number, because the mean of its divisors is an integer number (543678).

2^2145251 is an apocalyptic number.

2145251 is a deficient number, since it is larger than the sum of its proper divisors (29461).

2145251 is an equidigital number, since it uses as much as digits as its factorization.

2145251 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29460.

The product of its digits is 400, while the sum is 20.

The square root of 2145251 is about 1464.6675390682. The cubic root of 2145251 is about 128.9711892072.

The spelling of 2145251 in words is "two million, one hundred forty-five thousand, two hundred fifty-one".