53186989 has 2 divisors, whose sum is σ = 53186990. Its totient is φ = 53186988.

The previous prime is 53186983. The next prime is 53186993. The reversal of 53186989 is 98968135.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 50836900 + 2350089 = 7130^2 + 1533^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-53186989 is a prime.

It is a super-2 number, since 2×53186989² = 5657711597772242, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (53186983) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 26593494 + 26593495.

It is an arithmetic number, because the mean of its divisors is an integer number (26593495).

Almost surely, 2^53186989 is an apocalyptic number.

It is an amenable number.

53186989 is a deficient number, since it is larger than the sum of its proper divisors (1).

53186989 is an equidigital number, since it uses as much as digits as its factorization.

53186989 is an evil number, because the sum of its binary digits is even.

The product of its digits is 466560, while the sum is 49.

The square root of 53186989 is about 7292.9410391145. The cubic root of 53186989 is about 376.0698079418.

The spelling of 53186989 in words is "fifty-three million, one hundred eighty-six thousand, nine hundred eighty-nine".