8131906 has 4 divisors (see below), whose sum is σ = 12197862. Its totient is φ = 4065952.

The previous prime is 8131901. The next prime is 8131927. The reversal of 8131906 is 6091318.

It is a happy number.

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

It can be written as a sum of positive squares in only one way, i.e., 7789681 + 342225 = 2791^2 + 585^2 .

It is a super-2 number, since 2×8131906² = 132255790385672, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (8131901) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2032975 + ... + 2032978.

Almost surely, 2^8131906 is an apocalyptic number.

8131906 is a deficient number, since it is larger than the sum of its proper divisors (4065956).

8131906 is a wasteful number, since it uses less digits than its factorization.

8131906 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4065955.

The product of its (nonzero) digits is 1296, while the sum is 28.

The square root of 8131906 is about 2851.6496979819. The cubic root of 8131906 is about 201.0932300192.

The spelling of 8131906 in words is "eight million, one hundred thirty-one thousand, nine hundred six".