83721911 has 8 divisors (see below), whose sum is σ = 103042464. Its totient is φ = 66241440.

The previous prime is 83721907. The next prime is 83721947. The reversal of 83721911 is 11912738.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 83721911 - 2² = 83721907 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (83720911) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 459920 + ... + 460101.

It is an arithmetic number, because the mean of its divisors is an integer number (12880308).

Almost surely, 2^83721911 is an apocalyptic number.

83721911 is a deficient number, since it is larger than the sum of its proper divisors (19320553).

83721911 is a wasteful number, since it uses less digits than its factorization.

83721911 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 920041.

The product of its digits is 3024, while the sum is 32.

The square root of 83721911 is about 9149.9678141510. The cubic root of 83721911 is about 437.4680875770.

The spelling of 83721911 in words is "eighty-three million, seven hundred twenty-one thousand, nine hundred eleven".