53197381 has 2 divisors, whose sum is σ = 53197382. Its totient is φ = 53197380.

The previous prime is 53197357. The next prime is 53197393. The reversal of 53197381 is 18379135.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 46648900 + 6548481 = 6830^2 + 2559^2 .

It is a cyclic number.

It is not a de Polignac number, because 53197381 - 2⁷ = 53197253 is a prime.

It is a super-2 number, since 2×53197381² = 5659922690518322, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 53197381.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (53197181) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 26598690 + 26598691.

It is an arithmetic number, because the mean of its divisors is an integer number (26598691).

Almost surely, 2^53197381 is an apocalyptic number.

It is an amenable number.

53197381 is a deficient number, since it is larger than the sum of its proper divisors (1).

53197381 is an equidigital number, since it uses as much as digits as its factorization.

53197381 is an evil number, because the sum of its binary digits is even.

The product of its digits is 22680, while the sum is 37.

The square root of 53197381 is about 7293.6534740828. The cubic root of 53197381 is about 376.0942992884.

The spelling of 53197381 in words is "fifty-three million, one hundred ninety-seven thousand, three hundred eighty-one".