84641279 has 2 divisors, whose sum is σ = 84641280. Its totient is φ = 84641278.

The previous prime is 84641251. The next prime is 84641287. The reversal of 84641279 is 97214648.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-84641279 is a prime.

It is a super-2 number, since 2×84641279² = 14328292221511682, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (84647279) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42320639 + 42320640.

It is an arithmetic number, because the mean of its divisors is an integer number (42320640).

Almost surely, 2^84641279 is an apocalyptic number.

84641279 is a deficient number, since it is larger than the sum of its proper divisors (1).

84641279 is an equidigital number, since it uses as much as digits as its factorization.

84641279 is an evil number, because the sum of its binary digits is even.

The product of its digits is 96768, while the sum is 41.

The square root of 84641279 is about 9200.0695106070. The cubic root of 84641279 is about 439.0635714795.

The spelling of 84641279 in words is "eighty-four million, six hundred forty-one thousand, two hundred seventy-nine".