281137939 has 2 divisors, whose sum is σ = 281137940. Its totient is φ = 281137938.

The previous prime is 281137931. The next prime is 281137949. The reversal of 281137939 is 939731182.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 281137939 - 2³ = 281137931 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 281137895 and 281137904.

It is not a weakly prime, because it can be changed into another prime (281137931) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 140568969 + 140568970.

It is an arithmetic number, because the mean of its divisors is an integer number (140568970).

Almost surely, 2^281137939 is an apocalyptic number.

281137939 is a deficient number, since it is larger than the sum of its proper divisors (1).

281137939 is an equidigital number, since it uses as much as digits as its factorization.

281137939 is an evil number, because the sum of its binary digits is even.

The product of its digits is 81648, while the sum is 43.

The square root of 281137939 is about 16767.1684848695. The cubic root of 281137939 is about 655.0983198367.

The spelling of 281137939 in words is "two hundred eighty-one million, one hundred thirty-seven thousand, nine hundred thirty-nine".