281630137 has 2 divisors, whose sum is σ = 281630138. Its totient is φ = 281630136.

The previous prime is 281630123. The next prime is 281630171. The reversal of 281630137 is 731036182.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 171191056 + 110439081 = 13084^2 + 10509^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-281630137 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 281630099 and 281630108.

It is not a weakly prime, because it can be changed into another prime (281634137) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 140815068 + 140815069.

It is an arithmetic number, because the mean of its divisors is an integer number (140815069).

Almost surely, 2^281630137 is an apocalyptic number.

It is an amenable number.

281630137 is a deficient number, since it is larger than the sum of its proper divisors (1).

281630137 is an equidigital number, since it uses as much as digits as its factorization.

281630137 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6048, while the sum is 31.

The square root of 281630137 is about 16781.8394998880. The cubic root of 281630137 is about 655.4803981134.

The spelling of 281630137 in words is "two hundred eighty-one million, six hundred thirty thousand, one hundred thirty-seven".