53149991 has 2 divisors, whose sum is σ = 53149992. Its totient is φ = 53149990.

The previous prime is 53149979. The next prime is 53150023. The reversal of 53149991 is 19994135.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 53149991 - 2¹⁴ = 53133607 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (53149931) 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, 26574995 + 26574996.

It is an arithmetic number, because the mean of its divisors is an integer number (26574996).

Almost surely, 2^53149991 is an apocalyptic number.

53149991 is a deficient number, since it is larger than the sum of its proper divisors (1).

53149991 is an equidigital number, since it uses as much as digits as its factorization.

53149991 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 43740, while the sum is 41.

The square root of 53149991 is about 7290.4040354428. The cubic root of 53149991 is about 375.9825869973.

The spelling of 53149991 in words is "fifty-three million, one hundred forty-nine thousand, nine hundred ninety-one".