61511152231 has 2 divisors, whose sum is σ = 61511152232. Its totient is φ = 61511152230.

The previous prime is 61511152223. The next prime is 61511152243. The reversal of 61511152231 is 13225111516.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 61511152231 - 2³ = 61511152223 is a prime.

It is a super-2 number, since 2×61511152231² (a number of 22 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 61511152231.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (61511152211) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30755576115 + 30755576116.

It is an arithmetic number, because the mean of its divisors is an integer number (30755576116).

Almost surely, 2^61511152231 is an apocalyptic number.

61511152231 is a deficient number, since it is larger than the sum of its proper divisors (1).

61511152231 is an equidigital number, since it uses as much as digits as its factorization.

61511152231 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1800, while the sum is 28.

Adding to 61511152231 its reverse (13225111516), we get a palindrome (74736263747).

The spelling of 61511152231 in words is "sixty-one billion, five hundred eleven million, one hundred fifty-two thousand, two hundred thirty-one".