133615541 has 2 divisors, whose sum is σ = 133615542. Its totient is φ = 133615540.

The previous prime is 133615523. The next prime is 133615553. The reversal of 133615541 is 145516331.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 117180625 + 16434916 = 10825^2 + 4054^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-133615541 is a prime.

It is a super-2 number, since 2×133615541² = 35706225593445362, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (133615561) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 66807770 + 66807771.

It is an arithmetic number, because the mean of its divisors is an integer number (66807771).

Almost surely, 2^133615541 is an apocalyptic number.

It is an amenable number.

133615541 is a deficient number, since it is larger than the sum of its proper divisors (1).

133615541 is an equidigital number, since it uses as much as digits as its factorization.

133615541 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5400, while the sum is 29.

The square root of 133615541 is about 11559.2188749932. The cubic root of 133615541 is about 511.2331315983.

The spelling of 133615541 in words is "one hundred thirty-three million, six hundred fifteen thousand, five hundred forty-one".