28994531 has 2 divisors, whose sum is σ = 28994532. Its totient is φ = 28994530.

The previous prime is 28994527. The next prime is 28994549. The reversal of 28994531 is 13549982.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 28994531 - 2² = 28994527 is a prime.

It is a super-2 number, since 2×28994531² = 1681365655819922, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (28994431) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14497265 + 14497266.

It is an arithmetic number, because the mean of its divisors is an integer number (14497266).

Almost surely, 2^28994531 is an apocalyptic number.

28994531 is a deficient number, since it is larger than the sum of its proper divisors (1).

28994531 is an equidigital number, since it uses as much as digits as its factorization.

28994531 is an evil number, because the sum of its binary digits is even.

The product of its digits is 77760, while the sum is 41.

The square root of 28994531 is about 5384.6569992897. The cubic root of 28994531 is about 307.2123681352.

The spelling of 28994531 in words is "twenty-eight million, nine hundred ninety-four thousand, five hundred thirty-one".