133680731 has 2 divisors, whose sum is σ = 133680732. Its totient is φ = 133680730.

The previous prime is 133680697. The next prime is 133680763. The reversal of 133680731 is 137086331.

It is an a-pointer prime, because the next prime (133680763) can be obtained adding 133680731 to its sum of digits (32).

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-133680731 is a prime.

It is a super-2 number, since 2×133680731² = 35741075681388722, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (133680791) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 66840365 + 66840366.

It is an arithmetic number, because the mean of its divisors is an integer number (66840366).

Almost surely, 2^133680731 is an apocalyptic number.

133680731 is a deficient number, since it is larger than the sum of its proper divisors (1).

133680731 is an equidigital number, since it uses as much as digits as its factorization.

133680731 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 9072, while the sum is 32.

The square root of 133680731 is about 11562.0383583519. The cubic root of 133680731 is about 511.3162603248.

The spelling of 133680731 in words is "one hundred thirty-three million, six hundred eighty thousand, seven hundred thirty-one".