133440557 has 2 divisors, whose sum is σ = 133440558. Its totient is φ = 133440556.

The previous prime is 133440533. The next prime is 133440563. The reversal of 133440557 is 755044331.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 102292996 + 31147561 = 10114^2 + 5581^2 .

It is a cyclic number.

It is not a de Polignac number, because 133440557 - 2¹² = 133436461 is a prime.

It is equal to p_7562147 and since 133440557 and 7562147 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (133440577) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 66720278 + 66720279.

It is an arithmetic number, because the mean of its divisors is an integer number (66720279).

Almost surely, 2^133440557 is an apocalyptic number.

It is an amenable number.

133440557 is a deficient number, since it is larger than the sum of its proper divisors (1).

133440557 is an equidigital number, since it uses as much as digits as its factorization.

133440557 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 25200, while the sum is 32.

The square root of 133440557 is about 11551.6473716955. The cubic root of 133440557 is about 511.0098624149.

Adding to 133440557 its reverse (755044331), we get a palindrome (888484888).

The spelling of 133440557 in words is "one hundred thirty-three million, four hundred forty thousand, five hundred fifty-seven".