86729121 has 12 divisors (see below), whose sum is σ = 132644772. Its totient is φ = 54418176.

The previous prime is 86729119. The next prime is 86729131. The reversal of 86729121 is 12192768.

It can be written as a sum of positive squares in 2 ways, for example, as 71166096 + 15563025 = 8436^2 + 3945^2 .

It is not a de Polignac number, because 86729121 - 2¹ = 86729119 is a prime.

It is not an unprimeable number, because it can be changed into a prime (86729131) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 283276 + ... + 283581.

It is an arithmetic number, because the mean of its divisors is an integer number (11053731).

Almost surely, 2^86729121 is an apocalyptic number.

It is an amenable number.

86729121 is a deficient number, since it is larger than the sum of its proper divisors (45915651).

86729121 is a wasteful number, since it uses less digits than its factorization.

86729121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 566880 (or 566877 counting only the distinct ones).

The product of its digits is 12096, while the sum is 36.

The square root of 86729121 is about 9312.8470942027. The cubic root of 86729121 is about 442.6444075269.

The spelling of 86729121 in words is "eighty-six million, seven hundred twenty-nine thousand, one hundred twenty-one".