281121963 has 4 divisors (see below), whose sum is σ = 374829288. Its totient is φ = 187414640.

The previous prime is 281121923. The next prime is 281122007. The reversal of 281121963 is 369121182.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 281121963 - 2¹⁷ = 280990891 is a prime.

It is not an unprimeable number, because it can be changed into a prime (281121923) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 46853658 + ... + 46853663.

It is an arithmetic number, because the mean of its divisors is an integer number (93707322).

Almost surely, 2^281121963 is an apocalyptic number.

281121963 is a deficient number, since it is larger than the sum of its proper divisors (93707325).

281121963 is an equidigital number, since it uses as much as digits as its factorization.

281121963 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 93707324.

The product of its digits is 5184, while the sum is 33.

The square root of 281121963 is about 16766.6920708886. The cubic root of 281121963 is about 655.0859106862.

The spelling of 281121963 in words is "two hundred eighty-one million, one hundred twenty-one thousand, nine hundred sixty-three".