91851953321 has 2 divisors, whose sum is σ = 91851953322. Its totient is φ = 91851953320.

The previous prime is 91851953299. The next prime is 91851953353. The reversal of 91851953321 is 12335915819.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 64041388096 + 27810565225 = 253064^2 + 166765^2 .

It is a cyclic number.

It is not a de Polignac number, because 91851953321 - 2¹⁴ = 91851936937 is a prime.

It is a super-3 number, since 3×91851953321³ (a number of 34 digits) contains 333 as substring.

It is not a weakly prime, because it can be changed into another prime (91851953021) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45925976660 + 45925976661.

It is an arithmetic number, because the mean of its divisors is an integer number (45925976661).

Almost surely, 2^91851953321 is an apocalyptic number.

It is an amenable number.

91851953321 is a deficient number, since it is larger than the sum of its proper divisors (1).

91851953321 is an equidigital number, since it uses as much as digits as its factorization.

91851953321 is an evil number, because the sum of its binary digits is even.

The product of its digits is 291600, while the sum is 47.

The spelling of 91851953321 in words is "ninety-one billion, eight hundred fifty-one million, nine hundred fifty-three thousand, three hundred twenty-one".