90786131 has 2 divisors, whose sum is σ = 90786132. Its totient is φ = 90786130.

The previous prime is 90786119. The next prime is 90786133. The reversal of 90786131 is 13168709.

It is a strong prime.

It is an emirp because it is prime and its reverse (13168709) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-90786131 is a prime.

It is a super-2 number, since 2×90786131² = 16484243163898322, which contains 22 as substring.

Together with 90786133, it forms a pair of twin primes.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 90786091 and 90786100.

It is not a weakly prime, because it can be changed into another prime (90786133) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45393065 + 45393066.

It is an arithmetic number, because the mean of its divisors is an integer number (45393066).

Almost surely, 2^90786131 is an apocalyptic number.

90786131 is a deficient number, since it is larger than the sum of its proper divisors (1).

90786131 is an equidigital number, since it uses as much as digits as its factorization.

90786131 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 9072, while the sum is 35.

The square root of 90786131 is about 9528.1756385994. The cubic root of 90786131 is about 449.4414980679.

The spelling of 90786131 in words is "ninety million, seven hundred eighty-six thousand, one hundred thirty-one".