84401831 has 2 divisors, whose sum is σ = 84401832. Its totient is φ = 84401830.

The previous prime is 84401827. The next prime is 84401833. The reversal of 84401831 is 13810448.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 84401831 - 2² = 84401827 is a prime.

It is a super-5 number, since 5×84401831⁵ (a number of 41 digits) contains 55555 as substring. Note that it is a super-d number also for d = 2.

Together with 84401833, 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 = 84401794 and 84401803.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (84401833) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42200915 + 42200916.

It is an arithmetic number, because the mean of its divisors is an integer number (42200916).

Almost surely, 2^84401831 is an apocalyptic number.

84401831 is a deficient number, since it is larger than the sum of its proper divisors (1).

84401831 is an equidigital number, since it uses as much as digits as its factorization.

84401831 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3072, while the sum is 29.

The square root of 84401831 is about 9187.0469139980. The cubic root of 84401831 is about 438.6491472536.

The spelling of 84401831 in words is "eighty-four million, four hundred one thousand, eight hundred thirty-one".