134639831 has 4 divisors (see below), whose sum is σ = 134779464. Its totient is φ = 134500200.

The previous prime is 134639821. The next prime is 134639867. The reversal of 134639831 is 138936431.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 138936431 = 79 ⋅1758689.

It is a cyclic number.

It is not a de Polignac number, because 134639831 - 2¹⁸ = 134377687 is a prime.

It is a super-2 number, since 2×134639831² = 36255768183417122, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (134639821) 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, 68360 + ... + 70301.

It is an arithmetic number, because the mean of its divisors is an integer number (33694866).

Almost surely, 2^134639831 is an apocalyptic number.

134639831 is a deficient number, since it is larger than the sum of its proper divisors (139633).

134639831 is an equidigital number, since it uses as much as digits as its factorization.

134639831 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 139632.

The product of its digits is 46656, while the sum is 38.

The square root of 134639831 is about 11603.4404811676. The cubic root of 134639831 is about 512.5361700429.

The spelling of 134639831 in words is "one hundred thirty-four million, six hundred thirty-nine thousand, eight hundred thirty-one".