61551071 has 2 divisors, whose sum is σ = 61551072. Its totient is φ = 61551070.

The previous prime is 61551047. The next prime is 61551097. The reversal of 61551071 is 17015516.

It is an a-pointer prime, because the next prime (61551097) can be obtained adding 61551071 to its sum of digits (26).

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-61551071 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 61551071.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (61551011) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30775535 + 30775536.

It is an arithmetic number, because the mean of its divisors is an integer number (30775536).

Almost surely, 2^61551071 is an apocalyptic number.

61551071 is a deficient number, since it is larger than the sum of its proper divisors (1).

61551071 is an equidigital number, since it uses as much as digits as its factorization.

61551071 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1050, while the sum is 26.

The square root of 61551071 is about 7845.4490629919. The cubic root of 61551071 is about 394.8315705563.

Adding to 61551071 its reverse (17015516), we get a palindrome (78566587).

The spelling of 61551071 in words is "sixty-one million, five hundred fifty-one thousand, seventy-one".