91242737 has 2 divisors, whose sum is σ = 91242738. Its totient is φ = 91242736.

The previous prime is 91242713. The next prime is 91242743. The reversal of 91242737 is 73724219.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 90801841 + 440896 = 9529^2 + 664^2 .

It is a cyclic number.

It is not a de Polignac number, because 91242737 - 2²⁰ = 90194161 is a prime.

It is equal to p_5284952 and since 91242737 and 5284952 have the same sum of digits, it is a Honaker prime.

It is a junction number, because it is equal to n+sod(n) for n = 91242697 and 91242706.

It is not a weakly prime, because it can be changed into another prime (91242707) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45621368 + 45621369.

It is an arithmetic number, because the mean of its divisors is an integer number (45621369).

Almost surely, 2^91242737 is an apocalyptic number.

It is an amenable number.

91242737 is a deficient number, since it is larger than the sum of its proper divisors (1).

91242737 is an equidigital number, since it uses as much as digits as its factorization.

91242737 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 21168, while the sum is 35.

The square root of 91242737 is about 9552.1064169114. The cubic root of 91242737 is about 450.1937223530.

The spelling of 91242737 in words is "ninety-one million, two hundred forty-two thousand, seven hundred thirty-seven".