91506739 has 2 divisors, whose sum is σ = 91506740. Its totient is φ = 91506738.

The previous prime is 91506713. The next prime is 91506757. The reversal of 91506739 is 93760519.

It is a strong prime.

It is an emirp because it is prime and its reverse (93760519) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 91506739 - 2¹¹ = 91504691 is a prime.

It is not a weakly prime, because it can be changed into another prime (91006739) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45753369 + 45753370.

It is an arithmetic number, because the mean of its divisors is an integer number (45753370).

Almost surely, 2^91506739 is an apocalyptic number.

91506739 is a deficient number, since it is larger than the sum of its proper divisors (1).

91506739 is an equidigital number, since it uses as much as digits as its factorization.

91506739 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 51030, while the sum is 40.

The square root of 91506739 is about 9565.9154815417. The cubic root of 91506739 is about 450.6275015299.

The spelling of 91506739 in words is "ninety-one million, five hundred six thousand, seven hundred thirty-nine".