133198621 has 8 divisors (see below), whose sum is σ = 141386040. Its totient is φ = 125050368.

The previous prime is 133198609. The next prime is 133198633. The reversal of 133198621 is 126891331.

It is an interprime number because it is at equal distance from previous prime (133198609) and next prime (133198633).

It can be written as a sum of positive squares in 4 ways, for example, as 28238596 + 104960025 = 5314^2 + 10245^2 .

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

It is not a de Polignac number, because 133198621 - 2¹³ = 133190429 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 (133198691) 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, 2626 + ... + 16531.

It is an arithmetic number, because the mean of its divisors is an integer number (17673255).

Almost surely, 2^133198621 is an apocalyptic number.

It is an amenable number.

133198621 is a deficient number, since it is larger than the sum of its proper divisors (8187419).

133198621 is a wasteful number, since it uses less digits than its factorization.

133198621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19583.

The product of its digits is 7776, while the sum is 34.

The square root of 133198621 is about 11541.1706945180. The cubic root of 133198621 is about 510.7008447331.

The spelling of 133198621 in words is "one hundred thirty-three million, one hundred ninety-eight thousand, six hundred twenty-one".