61712281 has 2 divisors, whose sum is σ = 61712282. Its totient is φ = 61712280.

The previous prime is 61712249. The next prime is 61712309. The reversal of 61712281 is 18221716.

It is an a-pointer prime, because the next prime (61712309) can be obtained adding 61712281 to its sum of digits (28).

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 59536656 + 2175625 = 7716^2 + 1475^2 .

It is a cyclic number.

It is not a de Polignac number, because 61712281 - 2⁵ = 61712249 is a prime.

It is a super-2 number, since 2×61712281² = 7616811252445922, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (61712681) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30856140 + 30856141.

It is an arithmetic number, because the mean of its divisors is an integer number (30856141).

Almost surely, 2^61712281 is an apocalyptic number.

61712281 is the 4536-th hex number.

It is an amenable number.

61712281 is a deficient number, since it is larger than the sum of its proper divisors (1).

61712281 is an equidigital number, since it uses as much as digits as its factorization.

61712281 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1344, while the sum is 28.

The square root of 61712281 is about 7855.7164536406. The cubic root of 61712281 is about 395.1759745737.

Adding to 61712281 its reverse (18221716), we get a palindrome (79933997).

The spelling of 61712281 in words is "sixty-one million, seven hundred twelve thousand, two hundred eighty-one".