61243281 has 12 divisors (see below), whose sum is σ = 96504720. Its totient is φ = 37117080.

The previous prime is 61243279. The next prime is 61243283. The reversal of 61243281 is 18234216.

61243281 is a `hidden beast` number, since 612 + 43 + 2 + 8 + 1 = 666.

It is an interprime number because it is at equal distance from previous prime (61243279) and next prime (61243283).

It is not a de Polignac number, because 61243281 - 2¹ = 61243279 is a prime.

It is a super-2 number, since 2×61243281² = 7501478935289922, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (61243283) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 309211 + ... + 309408.

It is an arithmetic number, because the mean of its divisors is an integer number (8042060).

Almost surely, 2^61243281 is an apocalyptic number.

It is an amenable number.

61243281 is a deficient number, since it is larger than the sum of its proper divisors (35261439).

61243281 is a wasteful number, since it uses less digits than its factorization.

61243281 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 618636 (or 618633 counting only the distinct ones).

The product of its digits is 2304, while the sum is 27.

The square root of 61243281 is about 7825.8086483123. The cubic root of 61243281 is about 394.1723438005.

Adding to 61243281 its reverse (18234216), we get a palindrome (79477497).

It can be divided in two parts, 61 and 243281, that added together give a palindrome (243342).

The spelling of 61243281 in words is "sixty-one million, two hundred forty-three thousand, two hundred eighty-one".