84291131 has 2 divisors, whose sum is σ = 84291132. Its totient is φ = 84291130.

The previous prime is 84291127. The next prime is 84291133. The reversal of 84291131 is 13119248.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 84291131 - 2² = 84291127 is a prime.

It is a super-2 number, since 2×84291131² = 14209989530518322, which contains 22 as substring.

Together with 84291133, 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 = 84291094 and 84291103.

It is not a weakly prime, because it can be changed into another prime (84291133) 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, 42145565 + 42145566.

It is an arithmetic number, because the mean of its divisors is an integer number (42145566).

Almost surely, 2^84291131 is an apocalyptic number.

84291131 is a deficient number, since it is larger than the sum of its proper divisors (1).

84291131 is an equidigital number, since it uses as much as digits as its factorization.

84291131 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1728, while the sum is 29.

The square root of 84291131 is about 9181.0201502883. The cubic root of 84291131 is about 438.4572884397.

The spelling of 84291131 in words is "eighty-four million, two hundred ninety-one thousand, one hundred thirty-one".