28951291 has 2 divisors, whose sum is σ = 28951292. Its totient is φ = 28951290.

The previous prime is 28951277. The next prime is 28951297. The reversal of 28951291 is 19215982.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 28951291 - 2⁵ = 28951259 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 28951291.

It is not a weakly prime, because it can be changed into another prime (28951297) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14475645 + 14475646.

It is an arithmetic number, because the mean of its divisors is an integer number (14475646).

Almost surely, 2^28951291 is an apocalyptic number.

28951291 is a deficient number, since it is larger than the sum of its proper divisors (1).

28951291 is an equidigital number, since it uses as much as digits as its factorization.

28951291 is an evil number, because the sum of its binary digits is even.

The product of its digits is 12960, while the sum is 37.

The square root of 28951291 is about 5380.6403893960. The cubic root of 28951291 is about 307.0595752774.

It can be divided in two parts, 2895 and 1291, that added together give a triangular number (4186 = T₉₁).

The spelling of 28951291 in words is "twenty-eight million, nine hundred fifty-one thousand, two hundred ninety-one".