91547028757 has 2 divisors, whose sum is σ = 91547028758. Its totient is φ = 91547028756.

The previous prime is 91547028739. The next prime is 91547028809. The reversal of 91547028757 is 75782074519.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 90075615876 + 1471412881 = 300126^2 + 38359^2 .

It is a cyclic number.

It is not a de Polignac number, because 91547028757 - 2¹¹ = 91547026709 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 91547028698 and 91547028707.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (91547028557) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45773514378 + 45773514379.

It is an arithmetic number, because the mean of its divisors is an integer number (45773514379).

Almost surely, 2^91547028757 is an apocalyptic number.

It is an amenable number.

91547028757 is a deficient number, since it is larger than the sum of its proper divisors (1).

91547028757 is an equidigital number, since it uses as much as digits as its factorization.

91547028757 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4939200, while the sum is 55.

The spelling of 91547028757 in words is "ninety-one billion, five hundred forty-seven million, twenty-eight thousand, seven hundred fifty-seven".