53991919 has 2 divisors, whose sum is σ = 53991920. Its totient is φ = 53991918.

The previous prime is 53991877. The next prime is 53991923. The reversal of 53991919 is 91919935.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 53991919 - 2¹⁷ = 53860847 is a prime.

It is a super-2 number, since 2×53991919² = 5830254634605122, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (53991929) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 26995959 + 26995960.

It is an arithmetic number, because the mean of its divisors is an integer number (26995960).

Almost surely, 2^53991919 is an apocalyptic number.

53991919 is a deficient number, since it is larger than the sum of its proper divisors (1).

53991919 is an equidigital number, since it uses as much as digits as its factorization.

53991919 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 98415, while the sum is 46.

The square root of 53991919 is about 7347.9193653714. The cubic root of 53991919 is about 377.9574595427.

The spelling of 53991919 in words is "fifty-three million, nine hundred ninety-one thousand, nine hundred nineteen".