731686091 has 2 divisors, whose sum is σ = 731686092. Its totient is φ = 731686090.

The previous prime is 731686079. The next prime is 731686093. The reversal of 731686091 is 190686137.

It is a strong prime.

It is an emirp because it is prime and its reverse (190686137) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 731686091 - 2¹⁴ = 731669707 is a prime.

Together with 731686093, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (731686093) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 365843045 + 365843046.

It is an arithmetic number, because the mean of its divisors is an integer number (365843046).

Almost surely, 2^731686091 is an apocalyptic number.

731686091 is a deficient number, since it is larger than the sum of its proper divisors (1).

731686091 is an equidigital number, since it uses as much as digits as its factorization.

731686091 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 54432, while the sum is 41.

The square root of 731686091 is about 27049.6966896119. The cubic root of 731686091 is about 901.1040323696.

The spelling of 731686091 in words is "seven hundred thirty-one million, six hundred eighty-six thousand, ninety-one".