61281071 has 2 divisors, whose sum is σ = 61281072. Its totient is φ = 61281070.

The previous prime is 61281053. The next prime is 61281119. The reversal of 61281071 is 17018216.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 61281071 - 2⁶ = 61281007 is a prime.

It is equal to p_3633623 and since 61281071 and 3633623 have the same sum of digits, it is a Honaker prime.

It is a self number, because there is not a number n which added to its sum of digits gives 61281071.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (61281001) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30640535 + 30640536.

It is an arithmetic number, because the mean of its divisors is an integer number (30640536).

Almost surely, 2^61281071 is an apocalyptic number.

61281071 is a deficient number, since it is larger than the sum of its proper divisors (1).

61281071 is an equidigital number, since it uses as much as digits as its factorization.

61281071 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 672, while the sum is 26.

The square root of 61281071 is about 7828.2227229429. Note that the first 3 decimals coincide. The cubic root of 61281071 is about 394.2534014550.

Adding to 61281071 its reverse (17018216), we get a palindrome (78299287).

The spelling of 61281071 in words is "sixty-one million, two hundred eighty-one thousand, seventy-one".