91519643 has 2 divisors, whose sum is σ = 91519644. Its totient is φ = 91519642.

The previous prime is 91519583. The next prime is 91519651. The reversal of 91519643 is 34691519.

It is a strong prime.

It is an emirp because it is prime and its reverse (34691519) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 91519643 - 2⁶ = 91519579 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 91519597 and 91519606.

It is not a weakly prime, because it can be changed into another prime (91519693) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45759821 + 45759822.

It is an arithmetic number, because the mean of its divisors is an integer number (45759822).

Almost surely, 2^91519643 is an apocalyptic number.

91519643 is a deficient number, since it is larger than the sum of its proper divisors (1).

91519643 is an equidigital number, since it uses as much as digits as its factorization.

91519643 is an evil number, because the sum of its binary digits is even.

The product of its digits is 29160, while the sum is 38.

The square root of 91519643 is about 9566.5899358131. The cubic root of 91519643 is about 450.6486825708.

The spelling of 91519643 in words is "ninety-one million, five hundred nineteen thousand, six hundred forty-three".