133639487 has 2 divisors, whose sum is σ = 133639488. Its totient is φ = 133639486.

The previous prime is 133639427. The next prime is 133639489. The reversal of 133639487 is 784936331.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 133639487 - 2²⁶ = 66530623 is a prime.

Together with 133639489, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (133639489) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 66819743 + 66819744.

It is an arithmetic number, because the mean of its divisors is an integer number (66819744).

Almost surely, 2^133639487 is an apocalyptic number.

133639487 is a deficient number, since it is larger than the sum of its proper divisors (1).

133639487 is an equidigital number, since it uses as much as digits as its factorization.

133639487 is an evil number, because the sum of its binary digits is even.

The product of its digits is 326592, while the sum is 44.

The square root of 133639487 is about 11560.2546252234. The cubic root of 133639487 is about 511.2636701051.

The spelling of 133639487 in words is "one hundred thirty-three million, six hundred thirty-nine thousand, four hundred eighty-seven".