28131527 has 2 divisors, whose sum is σ = 28131528. Its totient is φ = 28131526.

The previous prime is 28131473. The next prime is 28131541. The reversal of 28131527 is 72513182.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 28131527 - 2¹⁰ = 28130503 is a prime.

It is a super-2 number, since 2×28131527² = 1582765622703458, which contains 22 as substring.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 28131527.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28131547) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14065763 + 14065764.

It is an arithmetic number, because the mean of its divisors is an integer number (14065764).

Almost surely, 2^28131527 is an apocalyptic number.

28131527 is a deficient number, since it is larger than the sum of its proper divisors (1).

28131527 is an equidigital number, since it uses as much as digits as its factorization.

28131527 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3360, while the sum is 29.

The square root of 28131527 is about 5303.9161946622. The cubic root of 28131527 is about 304.1336230153.

The spelling of 28131527 in words is "twenty-eight million, one hundred thirty-one thousand, five hundred twenty-seven".