133239813 has 16 divisors (see below), whose sum is σ = 203195520. Its totient is φ = 76075776.

The previous prime is 133239787. The next prime is 133239839. The reversal of 133239813 is 318932331.

It is an interprime number because it is at equal distance from previous prime (133239787) and next prime (133239839).

It is not a de Polignac number, because 133239813 - 2⁶ = 133239749 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (133234813) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 43393 + ... + 46361.

It is an arithmetic number, because the mean of its divisors is an integer number (12699720).

Almost surely, 2^133239813 is an apocalyptic number.

It is an amenable number.

133239813 is a deficient number, since it is larger than the sum of its proper divisors (69955707).

133239813 is a wasteful number, since it uses less digits than its factorization.

133239813 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5116.

The product of its digits is 11664, while the sum is 33.

The square root of 133239813 is about 11542.9551242305. The cubic root of 133239813 is about 510.7534844698.

The spelling of 133239813 in words is "one hundred thirty-three million, two hundred thirty-nine thousand, eight hundred thirteen".