61043909237 has 2 divisors, whose sum is σ = 61043909238. Its totient is φ = 61043909236.

The previous prime is 61043909233. The next prime is 61043909249. The reversal of 61043909237 is 73290934016.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 58774244356 + 2269664881 = 242434^2 + 47641^2 .

It is a cyclic number.

It is not a de Polignac number, because 61043909237 - 2² = 61043909233 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (61043909231) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30521954618 + 30521954619.

It is an arithmetic number, because the mean of its divisors is an integer number (30521954619).

Almost surely, 2^61043909237 is an apocalyptic number.

It is an amenable number.

61043909237 is a deficient number, since it is larger than the sum of its proper divisors (1).

61043909237 is an equidigital number, since it uses as much as digits as its factorization.

61043909237 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 244944, while the sum is 44.

The spelling of 61043909237 in words is "sixty-one billion, forty-three million, nine hundred nine thousand, two hundred thirty-seven".