28171951 has 2 divisors, whose sum is σ = 28171952. Its totient is φ = 28171950.

The previous prime is 28171939. The next prime is 28171967. The reversal of 28171951 is 15917182.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 28171951 - 2⁷ = 28171823 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28171921) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14085975 + 14085976.

It is an arithmetic number, because the mean of its divisors is an integer number (14085976).

Almost surely, 2^28171951 is an apocalyptic number.

28171951 is a deficient number, since it is larger than the sum of its proper divisors (1).

28171951 is an equidigital number, since it uses as much as digits as its factorization.

28171951 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5040, while the sum is 34.

The square root of 28171951 is about 5307.7255957708. The cubic root of 28171951 is about 304.2792296799.

The spelling of 28171951 in words is "twenty-eight million, one hundred seventy-one thousand, nine hundred fifty-one".