281220193 has 2 divisors, whose sum is σ = 281220194. Its totient is φ = 281220192.

The previous prime is 281220143. The next prime is 281220209. The reversal of 281220193 is 391022182.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 224790049 + 56430144 = 14993^2 + 7512^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-281220193 is a prime.

It is not a weakly prime, because it can be changed into another prime (281220143) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 140610096 + 140610097.

It is an arithmetic number, because the mean of its divisors is an integer number (140610097).

Almost surely, 2^281220193 is an apocalyptic number.

It is an amenable number.

281220193 is a deficient number, since it is larger than the sum of its proper divisors (1).

281220193 is an equidigital number, since it uses as much as digits as its factorization.

281220193 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1728, while the sum is 28.

The square root of 281220193 is about 16769.6211346589. The cubic root of 281220193 is about 655.1622021230.

It can be divided in two parts, 2812 and 20193, that added together give a triangular number (23005 = T₂₁₄).

The spelling of 281220193 in words is "two hundred eighty-one million, two hundred twenty thousand, one hundred ninety-three".