53481991 has 2 divisors, whose sum is σ = 53481992. Its totient is φ = 53481990.

The previous prime is 53481947. The next prime is 53482001. The reversal of 53481991 is 19918435.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 53481991 - 2⁷ = 53481863 is a prime.

It is a super-2 number, since 2×53481991² = 5720646722648162, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (53481931) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 26740995 + 26740996.

It is an arithmetic number, because the mean of its divisors is an integer number (26740996).

Almost surely, 2^53481991 is an apocalyptic number.

53481991 is a deficient number, since it is larger than the sum of its proper divisors (1).

53481991 is an equidigital number, since it uses as much as digits as its factorization.

53481991 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 38880, while the sum is 40.

The square root of 53481991 is about 7313.1382456508. The cubic root of 53481991 is about 376.7638176671.

The spelling of 53481991 in words is "fifty-three million, four hundred eighty-one thousand, nine hundred ninety-one".