55320197 has 4 divisors (see below), whose sum is σ = 57227820. Its totient is φ = 53412576.

The previous prime is 55320173. The next prime is 55320211. The reversal of 55320197 is 79102355.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 16370116 + 38950081 = 4046^2 + 6241^2 .

It is a cyclic number.

It is not a de Polignac number, because 55320197 - 2²⁰ = 54271621 is a prime.

It is a super-2 number, since 2×55320197² = 6120648392237618, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55320157) 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, 953768 + ... + 953825.

It is an arithmetic number, because the mean of its divisors is an integer number (14306955).

Almost surely, 2^55320197 is an apocalyptic number.

It is an amenable number.

55320197 is a deficient number, since it is larger than the sum of its proper divisors (1907623).

55320197 is a wasteful number, since it uses less digits than its factorization.

55320197 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1907622.

The product of its (nonzero) digits is 9450, while the sum is 32.

The square root of 55320197 is about 7437.7548359703. The cubic root of 55320197 is about 381.0318148884.

The spelling of 55320197 in words is "fifty-five million, three hundred twenty thousand, one hundred ninety-seven".