228136691 has 2 divisors, whose sum is σ = 228136692. Its totient is φ = 228136690.

The previous prime is 228136681. The next prime is 228136693. The reversal of 228136691 is 196631822.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 228136691 - 2⁶ = 228136627 is a prime.

Together with 228136693, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (228136693) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 114068345 + 114068346.

It is an arithmetic number, because the mean of its divisors is an integer number (114068346).

Almost surely, 2^228136691 is an apocalyptic number.

228136691 is a deficient number, since it is larger than the sum of its proper divisors (1).

228136691 is an equidigital number, since it uses as much as digits as its factorization.

228136691 is an evil number, because the sum of its binary digits is even.

The product of its digits is 31104, while the sum is 38.

The square root of 228136691 is about 15104.1944836525. The cubic root of 228136691 is about 611.0335349816.

The spelling of 228136691 in words is "two hundred twenty-eight million, one hundred thirty-six thousand, six hundred ninety-one".