28569131 has 2 divisors, whose sum is σ = 28569132. Its totient is φ = 28569130.

The previous prime is 28569127. The next prime is 28569161. The reversal of 28569131 is 13196582.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 28569131 - 2² = 28569127 is a prime.

It is a super-2 number, since 2×28569131² = 1632390492190322, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 28569091 and 28569100.

It is not a weakly prime, because it can be changed into another prime (28569161) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14284565 + 14284566.

It is an arithmetic number, because the mean of its divisors is an integer number (14284566).

Almost surely, 2^28569131 is an apocalyptic number.

28569131 is a deficient number, since it is larger than the sum of its proper divisors (1).

28569131 is an equidigital number, since it uses as much as digits as its factorization.

28569131 is an evil number, because the sum of its binary digits is even.

The product of its digits is 12960, while the sum is 35.

The square root of 28569131 is about 5345.0099158000. The cubic root of 28569131 is about 305.7025139377.

The spelling of 28569131 in words is "twenty-eight million, five hundred sixty-nine thousand, one hundred thirty-one".