133920557 has 2 divisors, whose sum is σ = 133920558. Its totient is φ = 133920556.

The previous prime is 133920539. The next prime is 133920587. The reversal of 133920557 is 755029331.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 68326756 + 65593801 = 8266^2 + 8099^2 .

It is a cyclic number.

It is not a de Polignac number, because 133920557 - 2²² = 129726253 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (133920517) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 66960278 + 66960279.

It is an arithmetic number, because the mean of its divisors is an integer number (66960279).

Almost surely, 2^133920557 is an apocalyptic number.

It is an amenable number.

133920557 is a deficient number, since it is larger than the sum of its proper divisors (1).

133920557 is an equidigital number, since it uses as much as digits as its factorization.

133920557 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 28350, while the sum is 35.

The square root of 133920557 is about 11572.4049790871. The cubic root of 133920557 is about 511.6218483074.

Adding to 133920557 its reverse (755029331), we get a palindrome (888949888).

The spelling of 133920557 in words is "one hundred thirty-three million, nine hundred twenty thousand, five hundred fifty-seven".