133013261 has 4 divisors (see below), whose sum is σ = 136608252. Its totient is φ = 129418272.

The previous prime is 133013249. The next prime is 133013267. The reversal of 133013261 is 162310331.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 120868036 + 12145225 = 10994^2 + 3485^2 .

It is a cyclic number.

It is not a de Polignac number, because 133013261 - 2⁶ = 133013197 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (133013267) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1797440 + ... + 1797513.

It is an arithmetic number, because the mean of its divisors is an integer number (34152063).

Almost surely, 2^133013261 is an apocalyptic number.

It is an amenable number.

133013261 is a deficient number, since it is larger than the sum of its proper divisors (3594991).

133013261 is an equidigital number, since it uses as much as digits as its factorization.

133013261 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3594990.

The product of its (nonzero) digits is 324, while the sum is 20.

The square root of 133013261 is about 11533.1375176055. The cubic root of 133013261 is about 510.4638366388.

Adding to 133013261 its reverse (162310331), we get a palindrome (295323592).

The spelling of 133013261 in words is "one hundred thirty-three million, thirteen thousand, two hundred sixty-one".