281381123 has 2 divisors, whose sum is σ = 281381124. Its totient is φ = 281381122.

The previous prime is 281381119. The next prime is 281381137. The reversal of 281381123 is 321183182.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 281381123 - 2² = 281381119 is a prime.

It is a super-2 number, since 2×281381123² = 158350672761482258, which contains 22 as substring.

It is equal to p_15297140 and since 281381123 and 15297140 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (281381143) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 140690561 + 140690562.

It is an arithmetic number, because the mean of its divisors is an integer number (140690562).

Almost surely, 2^281381123 is an apocalyptic number.

281381123 is a deficient number, since it is larger than the sum of its proper divisors (1).

281381123 is an equidigital number, since it uses as much as digits as its factorization.

281381123 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2304, while the sum is 29.

The square root of 281381123 is about 16774.4187082593. The cubic root of 281381123 is about 655.2871518365.

The spelling of 281381123 in words is "two hundred eighty-one million, three hundred eighty-one thousand, one hundred twenty-three".