84438131 has 2 divisors, whose sum is σ = 84438132. Its totient is φ = 84438130.

The previous prime is 84438119. The next prime is 84438149. The reversal of 84438131 is 13183448.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-84438131 is a prime.

It is a super-2 number, since 2×84438131² = 14259595933546322, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (84438331) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42219065 + 42219066.

It is an arithmetic number, because the mean of its divisors is an integer number (42219066).

Almost surely, 2^84438131 is an apocalyptic number.

84438131 is a deficient number, since it is larger than the sum of its proper divisors (1).

84438131 is an equidigital number, since it uses as much as digits as its factorization.

84438131 is an evil number, because the sum of its binary digits is even.

The product of its digits is 9216, while the sum is 32.

The square root of 84438131 is about 9189.0223092558. The cubic root of 84438131 is about 438.7120237799.

The spelling of 84438131 in words is "eighty-four million, four hundred thirty-eight thousand, one hundred thirty-one".