281601961 has 9 divisors (see below), whose sum is σ = 286189221. Its totient is φ = 277087872.

The previous prime is 281601941. The next prime is 281601997. The reversal of 281601961 is 169106182.

The square root of 281601961 is 16781.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in 4 ways, for example, as 48734361 + 232867600 = 6981^2 + 15260^2 .

It is not a de Polignac number, because 281601961 - 2¹³ = 281593769 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (281601941) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 1627671 + ... + 1627843.

Almost surely, 2^281601961 is an apocalyptic number.

281601961 is the 16781-st square number.

281601961 is the 8391-st centered octagonal number.

It is an amenable number.

281601961 is a deficient number, since it is larger than the sum of its proper divisors (4587260).

281601961 is an frugal number, since it uses more digits than its factorization.

281601961 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 540 (or 270 counting only the distinct ones).

The product of its (nonzero) digits is 5184, while the sum is 34.

The cubic root of 281601961 is about 655.4585379628.

Multiplying 281601961 by its product of nonzero digits (5184), we get a square (1459824565824 = 1208232²).

The spelling of 281601961 in words is "two hundred eighty-one million, six hundred one thousand, nine hundred sixty-one".