133721652 has 12 divisors (see below), whose sum is σ = 312017216. Its totient is φ = 44573880.

The previous prime is 133721647. The next prime is 133721657. The reversal of 133721652 is 256127331.

It is an interprime number because it is at equal distance from previous prime (133721647) and next prime (133721657).

It is a tau number, because it is divible by the number of its divisors (12).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (133721657) 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, 5571724 + ... + 5571747.

Almost surely, 2^133721652 is an apocalyptic number.

133721652 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

133721652 is an abundant number, since it is smaller than the sum of its proper divisors (178295564).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

133721652 is a wasteful number, since it uses less digits than its factorization.

133721652 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11143478 (or 11143476 counting only the distinct ones).

The product of its digits is 7560, while the sum is 30.

The square root of 133721652 is about 11563.8078503579. The cubic root of 133721652 is about 511.3684279980.

Adding to 133721652 its reverse (256127331), we get a palindrome (389848983).

The spelling of 133721652 in words is "one hundred thirty-three million, seven hundred twenty-one thousand, six hundred fifty-two".