28519531 has 2 divisors, whose sum is σ = 28519532. Its totient is φ = 28519530.

The previous prime is 28519529. The next prime is 28519537. The reversal of 28519531 is 13591582.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 28519531 - 2¹ = 28519529 is a prime.

It is a super-2 number, since 2×28519531² = 1626727296919922, which contains 22 as substring.

Together with 28519529, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (28519537) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14259765 + 14259766.

It is an arithmetic number, because the mean of its divisors is an integer number (14259766).

Almost surely, 2^28519531 is an apocalyptic number.

28519531 is a deficient number, since it is larger than the sum of its proper divisors (1).

28519531 is an equidigital number, since it uses as much as digits as its factorization.

28519531 is an evil number, because the sum of its binary digits is even.

The product of its digits is 10800, while the sum is 34.

The square root of 28519531 is about 5340.3680584769. The cubic root of 28519531 is about 305.5254973750.

The spelling of 28519531 in words is "twenty-eight million, five hundred nineteen thousand, five hundred thirty-one".