133875621 has 12 divisors (see below), whose sum is σ = 210955680. Its totient is φ = 81136680.

The previous prime is 133875613. The next prime is 133875631. The reversal of 133875621 is 126578331.

133875621 is a `hidden beast` number, since 13 + 3 + 87 + 562 + 1 = 666.

It is not a de Polignac number, because 133875621 - 2³ = 133875613 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (133875631) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 676041 + ... + 676238.

It is an arithmetic number, because the mean of its divisors is an integer number (17579640).

Almost surely, 2^133875621 is an apocalyptic number.

133875621 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

133875621 is a deficient number, since it is larger than the sum of its proper divisors (77080059).

133875621 is a wasteful number, since it uses less digits than its factorization.

133875621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1352296 (or 1352293 counting only the distinct ones).

The product of its digits is 30240, while the sum is 36.

The square root of 133875621 is about 11570.4633010092. The cubic root of 133875621 is about 511.5646183302.

The spelling of 133875621 in words is "one hundred thirty-three million, eight hundred seventy-five thousand, six hundred twenty-one".