2151267 has 4 divisors (see below), whose sum is σ = 2868360. Its totient is φ = 1434176.

The previous prime is 2151263. The next prime is 2151269. The reversal of 2151267 is 7621512.

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 2151267 - 2² = 2151263 is a prime.

It is an Ulam number.

It is a D-number.

2151267 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (2151263) 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, 358542 + ... + 358547.

It is an arithmetic number, because the mean of its divisors is an integer number (717090).

2^2151267 is an apocalyptic number.

2151267 is a deficient number, since it is larger than the sum of its proper divisors (717093).

2151267 is an equidigital number, since it uses as much as digits as its factorization.

2151267 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 717092.

The product of its digits is 840, while the sum is 24.

The square root of 2151267 is about 1466.7198096433. The cubic root of 2151267 is about 129.0916361101.

Adding to 2151267 its reverse (7621512), we get a palindrome (9772779).

The spelling of 2151267 in words is "two million, one hundred fifty-one thousand, two hundred sixty-seven".