133420261 has 24 divisors (see below), whose sum is σ = 156325920. Its totient is φ = 113420736.

The previous prime is 133420253. The next prime is 133420277. The reversal of 133420261 is 162024331.

It is not a de Polignac number, because 133420261 - 2³ = 133420253 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (133420241) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 118246 + ... + 119368.

It is an arithmetic number, because the mean of its divisors is an integer number (6513580).

Almost surely, 2^133420261 is an apocalyptic number.

It is an amenable number.

133420261 is a deficient number, since it is larger than the sum of its proper divisors (22905659).

133420261 is a wasteful number, since it uses less digits than its factorization.

133420261 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1205 (or 1192 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 22.

The square root of 133420261 is about 11550.7688488689. The cubic root of 133420261 is about 510.9839532953.

Adding to 133420261 its reverse (162024331), we get a palindrome (295444592).

The spelling of 133420261 in words is "one hundred thirty-three million, four hundred twenty thousand, two hundred sixty-one".