2151569 has 4 divisors (see below), whose sum is σ = 2458944. Its totient is φ = 1844196.

The previous prime is 2151563. The next prime is 2151593. The reversal of 2151569 is 9651512.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 2151569 - 2¹² = 2147473 is a prime.

It is a super-2 number, since 2×2151569² = 9258498323522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2151563) 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, 153677 + ... + 153690.

It is an arithmetic number, because the mean of its divisors is an integer number (614736).

2^2151569 is an apocalyptic number.

It is an amenable number.

2151569 is a deficient number, since it is larger than the sum of its proper divisors (307375).

2151569 is an equidigital number, since it uses as much as digits as its factorization.

2151569 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 307374.

The product of its digits is 2700, while the sum is 29.

The square root of 2151569 is about 1466.8227568456. The cubic root of 2151569 is about 129.0976765582.

The spelling of 2151569 in words is "two million, one hundred fifty-one thousand, five hundred sixty-nine".