84721513 has 4 divisors (see below), whose sum is σ = 89180560. Its totient is φ = 80262468.

The previous prime is 84721493. The next prime is 84721519. The reversal of 84721513 is 31512748.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-84721513 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (84721519) 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, 2229495 + ... + 2229532.

It is an arithmetic number, because the mean of its divisors is an integer number (22295140).

Almost surely, 2^84721513 is an apocalyptic number.

It is an amenable number.

84721513 is a deficient number, since it is larger than the sum of its proper divisors (4459047).

84721513 is a wasteful number, since it uses less digits than its factorization.

84721513 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4459046.

The product of its digits is 6720, while the sum is 31.

The square root of 84721513 is about 9204.4289882643. The cubic root of 84721513 is about 439.2022614966.

The spelling of 84721513 in words is "eighty-four million, seven hundred twenty-one thousand, five hundred thirteen".