397521133 has 4 divisors (see below), whose sum is σ = 398799648. Its totient is φ = 396242620.

The previous prime is 397521109. The next prime is 397521143. The reversal of 397521133 is 331125793.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 397521133 - 2¹⁷ = 397390061 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 (397521143) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 638791 + ... + 639412.

It is an arithmetic number, because the mean of its divisors is an integer number (99699912).

Almost surely, 2^397521133 is an apocalyptic number.

It is an amenable number.

397521133 is a deficient number, since it is larger than the sum of its proper divisors (1278515).

397521133 is a wasteful number, since it uses less digits than its factorization.

397521133 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1278514.

The product of its digits is 17010, while the sum is 34.

The square root of 397521133 is about 19937.9320141282. The cubic root of 397521133 is about 735.2811074001.

The spelling of 397521133 in words is "three hundred ninety-seven million, five hundred twenty-one thousand, one hundred thirty-three".