281421251 has 2 divisors, whose sum is σ = 281421252. Its totient is φ = 281421250.

The previous prime is 281421241. The next prime is 281421277. The reversal of 281421251 is 152124182.

It is an a-pointer prime, because the next prime (281421277) can be obtained adding 281421251 to its sum of digits (26).

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-281421251 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 281421251.

It is not a weakly prime, because it can be changed into another prime (281421221) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 140710625 + 140710626.

It is an arithmetic number, because the mean of its divisors is an integer number (140710626).

Almost surely, 2^281421251 is an apocalyptic number.

281421251 is a deficient number, since it is larger than the sum of its proper divisors (1).

281421251 is an equidigital number, since it uses as much as digits as its factorization.

281421251 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1280, while the sum is 26.

The square root of 281421251 is about 16775.6147726395. The cubic root of 281421251 is about 655.3183007075.

The spelling of 281421251 in words is "two hundred eighty-one million, four hundred twenty-one thousand, two hundred fifty-one".