133261505 has 8 divisors (see below), whose sum is σ = 172214952. Its totient is φ = 98408448.

The previous prime is 133261501. The next prime is 133261519. The reversal of 133261505 is 505162331.

It can be written as a sum of positive squares in 4 ways, for example, as 13315201 + 119946304 = 3649^2 + 10952^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 133261505 - 2² = 133261501 is a prime.

It is not an unprimeable number, because it can be changed into a prime (133261501) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1025024 + ... + 1025153.

It is an arithmetic number, because the mean of its divisors is an integer number (21526869).

Almost surely, 2^133261505 is an apocalyptic number.

It is an amenable number.

133261505 is a deficient number, since it is larger than the sum of its proper divisors (38953447).

133261505 is a wasteful number, since it uses less digits than its factorization.

133261505 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2050195.

The product of its (nonzero) digits is 2700, while the sum is 26.

The square root of 133261505 is about 11543.8947067270. The cubic root of 133261505 is about 510.7812005684.

The spelling of 133261505 in words is "one hundred thirty-three million, two hundred sixty-one thousand, five hundred five".