228651091 has 2 divisors, whose sum is σ = 228651092. Its totient is φ = 228651090.

The previous prime is 228651029. The next prime is 228651097. The reversal of 228651091 is 190156822.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 228651091 - 2¹³ = 228642899 is a prime.

It is not a weakly prime, because it can be changed into another prime (228651097) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 114325545 + 114325546.

It is an arithmetic number, because the mean of its divisors is an integer number (114325546).

Almost surely, 2^228651091 is an apocalyptic number.

228651091 is a deficient number, since it is larger than the sum of its proper divisors (1).

228651091 is an equidigital number, since it uses as much as digits as its factorization.

228651091 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 8640, while the sum is 34.

The square root of 228651091 is about 15121.2132780409. The cubic root of 228651091 is about 611.4924407164.

The spelling of 228651091 in words is "two hundred twenty-eight million, six hundred fifty-one thousand, ninety-one".