53500991 has 2 divisors, whose sum is σ = 53500992. Its totient is φ = 53500990.

The previous prime is 53500957. The next prime is 53500999. The reversal of 53500991 is 19900535.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 53500991 - 2¹⁰ = 53499967 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (53500999) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 26750495 + 26750496.

It is an arithmetic number, because the mean of its divisors is an integer number (26750496).

Almost surely, 2^53500991 is an apocalyptic number.

53500991 is a deficient number, since it is larger than the sum of its proper divisors (1).

53500991 is an equidigital number, since it uses as much as digits as its factorization.

53500991 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6075, while the sum is 32.

The square root of 53500991 is about 7314.4371622156. The cubic root of 53500991 is about 376.8084287275.

The spelling of 53500991 in words is "fifty-three million, five hundred thousand, nine hundred ninety-one".