281421261 has 24 divisors (see below), whose sum is σ = 462735936. Its totient is φ = 163141440.

The previous prime is 281421251. The next prime is 281421277. The reversal of 281421261 is 162124182.

It is not a de Polignac number, because 281421261 - 2⁹ = 281420749 is a prime.

It is a super-2 number, since 2×281421261² = 158395852285660242, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (281421221) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 59520 + ... + 64073.

It is an arithmetic number, because the mean of its divisors is an integer number (19280664).

Almost surely, 2^281421261 is an apocalyptic number.

It is an amenable number.

281421261 is a deficient number, since it is larger than the sum of its proper divisors (181314675).

281421261 is a wasteful number, since it uses less digits than its factorization.

281421261 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 123633 (or 123630 counting only the distinct ones).

The product of its digits is 1536, while the sum is 27.

The square root of 281421261 is about 16775.6150706911. The cubic root of 281421261 is about 655.3183084695.

It can be divided in two parts, 28142 and 1261, that added together give a triangular number (29403 = T₂₄₂).

The spelling of 281421261 in words is "two hundred eighty-one million, four hundred twenty-one thousand, two hundred sixty-one".