84740991 has 4 divisors (see below), whose sum is σ = 112987992. Its totient is φ = 56493992.

The previous prime is 84740963. The next prime is 84741001. The reversal of 84740991 is 19904748.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 84740991 - 2⁵ = 84740959 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (84740951) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 14123496 + ... + 14123501.

It is an arithmetic number, because the mean of its divisors is an integer number (28246998).

Almost surely, 2^84740991 is an apocalyptic number.

84740991 is a deficient number, since it is larger than the sum of its proper divisors (28247001).

84740991 is a wasteful number, since it uses less digits than its factorization.

84740991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28247000.

The product of its (nonzero) digits is 72576, while the sum is 42.

The square root of 84740991 is about 9205.4870050422. The cubic root of 84740991 is about 439.2359173565.

The spelling of 84740991 in words is "eighty-four million, seven hundred forty thousand, nine hundred ninety-one".