83640951 has 8 divisors (see below), whose sum is σ = 123912560. Its totient is φ = 55760616.

The previous prime is 83640929. The next prime is 83641027. The reversal of 83640951 is 15904638.

83640951 is a `hidden beast` number, since 8 + 3 + 640 + 9 + 5 + 1 = 666.

It is not a de Polignac number, because 83640951 - 2¹⁵ = 83608183 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (83640251) 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, 1548880 + ... + 1548933.

It is an arithmetic number, because the mean of its divisors is an integer number (15489070).

Almost surely, 2^83640951 is an apocalyptic number.

83640951 is a deficient number, since it is larger than the sum of its proper divisors (40271609).

83640951 is a wasteful number, since it uses less digits than its factorization.

83640951 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3097822 (or 3097816 counting only the distinct ones).

The product of its (nonzero) digits is 25920, while the sum is 36.

The square root of 83640951 is about 9145.5426848274. The cubic root of 83640951 is about 437.3270299637.

The spelling of 83640951 in words is "eighty-three million, six hundred forty thousand, nine hundred fifty-one".