28181051 has 2 divisors, whose sum is σ = 28181052. Its totient is φ = 28181050.

The previous prime is 28181017. The next prime is 28181089. The reversal of 28181051 is 15018182.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 28181051 - 2¹⁴ = 28164667 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 28181051.

It is not a weakly prime, because it can be changed into another prime (28181551) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14090525 + 14090526.

It is an arithmetic number, because the mean of its divisors is an integer number (14090526).

Almost surely, 2^28181051 is an apocalyptic number.

28181051 is a deficient number, since it is larger than the sum of its proper divisors (1).

28181051 is an equidigital number, since it uses as much as digits as its factorization.

28181051 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 640, while the sum is 26.

The square root of 28181051 is about 5308.5827675567. The cubic root of 28181051 is about 304.3119885389.

The spelling of 28181051 in words is "twenty-eight million, one hundred eighty-one thousand, fifty-one".