281630461 has 4 divisors (see below), whose sum is σ = 321863392. Its totient is φ = 241397532.

The previous prime is 281630429. The next prime is 281630467. The reversal of 281630461 is 164036182.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 164036182 = 2 ⋅82018091.

It is a cyclic number.

It is not a de Polignac number, because 281630461 - 2⁵ = 281630429 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (281630467) 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, 20116455 + ... + 20116468.

It is an arithmetic number, because the mean of its divisors is an integer number (80465848).

Almost surely, 2^281630461 is an apocalyptic number.

It is an amenable number.

281630461 is a deficient number, since it is larger than the sum of its proper divisors (40232931).

281630461 is an equidigital number, since it uses as much as digits as its factorization.

281630461 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40232930.

The product of its (nonzero) digits is 6912, while the sum is 31.

The square root of 281630461 is about 16781.8491531774. The cubic root of 281630461 is about 655.4806494780.

The spelling of 281630461 in words is "two hundred eighty-one million, six hundred thirty thousand, four hundred sixty-one".