84505831 has 2 divisors, whose sum is σ = 84505832. Its totient is φ = 84505830.

The previous prime is 84505723. The next prime is 84505867. The reversal of 84505831 is 13850548.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 84505831 - 2¹⁵ = 84473063 is a prime.

It is a super-2 number, since 2×84505831² = 14282470946001122, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (84503831) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42252915 + 42252916.

It is an arithmetic number, because the mean of its divisors is an integer number (42252916).

Almost surely, 2^84505831 is an apocalyptic number.

84505831 is a deficient number, since it is larger than the sum of its proper divisors (1).

84505831 is an equidigital number, since it uses as much as digits as its factorization.

84505831 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 19200, while the sum is 34.

The square root of 84505831 is about 9192.7053145415. The cubic root of 84505831 is about 438.8292412402.

The spelling of 84505831 in words is "eighty-four million, five hundred five thousand, eight hundred thirty-one".