84242731 has 2 divisors, whose sum is σ = 84242732. Its totient is φ = 84242730.

The previous prime is 84242729. The next prime is 84242791. The reversal of 84242731 is 13724248.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 84242731 - 2¹ = 84242729 is a prime.

It is a super-2 number, since 2×84242731² = 14193675452676722, which contains 22 as substring.

Together with 84242729, 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 = 84242693 and 84242702.

It is not a weakly prime, because it can be changed into another prime (84242791) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42121365 + 42121366.

It is an arithmetic number, because the mean of its divisors is an integer number (42121366).

Almost surely, 2^84242731 is an apocalyptic number.

84242731 is a deficient number, since it is larger than the sum of its proper divisors (1).

84242731 is an equidigital number, since it uses as much as digits as its factorization.

84242731 is an evil number, because the sum of its binary digits is even.

The product of its digits is 10752, while the sum is 31.

The square root of 84242731 is about 9178.3838991404. The cubic root of 84242731 is about 438.3733515906.

Adding to 84242731 its reverse (13724248), we get a palindrome (97966979).

The spelling of 84242731 in words is "eighty-four million, two hundred forty-two thousand, seven hundred thirty-one".