91547028739 has 2 divisors, whose sum is σ = 91547028740. Its totient is φ = 91547028738.

The previous prime is 91547028701. The next prime is 91547028757. The reversal of 91547028739 is 93782074519.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 91547028739 - 2¹⁹ = 91546504451 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 91547028739.

It is not a weakly prime, because it can be changed into another prime (91547028539) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45773514369 + 45773514370.

It is an arithmetic number, because the mean of its divisors is an integer number (45773514370).

Almost surely, 2^91547028739 is an apocalyptic number.

91547028739 is a deficient number, since it is larger than the sum of its proper divisors (1).

91547028739 is an equidigital number, since it uses as much as digits as its factorization.

91547028739 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3810240, while the sum is 55.

The spelling of 91547028739 in words is "ninety-one billion, five hundred forty-seven million, twenty-eight thousand, seven hundred thirty-nine".