91431850229 has 2 divisors, whose sum is σ = 91431850230. Its totient is φ = 91431850228.

The previous prime is 91431850123. The next prime is 91431850241. The reversal of 91431850229 is 92205813419.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 91431850129 + 100 = 302377^2 + 10^2 .

It is an emirp because it is prime and its reverse (92205813419) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-91431850229 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 91431850229.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (91431858229) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45715925114 + 45715925115.

It is an arithmetic number, because the mean of its divisors is an integer number (45715925115).

Almost surely, 2^91431850229 is an apocalyptic number.

It is an amenable number.

91431850229 is a deficient number, since it is larger than the sum of its proper divisors (1).

91431850229 is an equidigital number, since it uses as much as digits as its factorization.

91431850229 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 155520, while the sum is 44.

The spelling of 91431850229 in words is "ninety-one billion, four hundred thirty-one million, eight hundred fifty thousand, two hundred twenty-nine".