53117381 has 2 divisors, whose sum is σ = 53117382. Its totient is φ = 53117380.

The previous prime is 53117371. The next prime is 53117387. The reversal of 53117381 is 18371135.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 30980356 + 22137025 = 5566^2 + 4705^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-53117381 is a prime.

It is a super-2 number, since 2×53117381² = 5642912328598322, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (53117387) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 26558690 + 26558691.

It is an arithmetic number, because the mean of its divisors is an integer number (26558691).

Almost surely, 2^53117381 is an apocalyptic number.

It is an amenable number.

53117381 is a deficient number, since it is larger than the sum of its proper divisors (1).

53117381 is an equidigital number, since it uses as much as digits as its factorization.

53117381 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2520, while the sum is 29.

The square root of 53117381 is about 7288.1671907277. The cubic root of 53117381 is about 375.9056769777.

The spelling of 53117381 in words is "fifty-three million, one hundred seventeen thousand, three hundred eighty-one".