53007991 has 2 divisors, whose sum is σ = 53007992. Its totient is φ = 53007990.

The previous prime is 53007959. The next prime is 53008009. The reversal of 53007991 is 19970035.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 53007991 - 2⁵ = 53007959 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (53067991) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 26503995 + 26503996.

It is an arithmetic number, because the mean of its divisors is an integer number (26503996).

Almost surely, 2^53007991 is an apocalyptic number.

53007991 is a deficient number, since it is larger than the sum of its proper divisors (1).

53007991 is an equidigital number, since it uses as much as digits as its factorization.

53007991 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 8505, while the sum is 34.

The square root of 53007991 is about 7280.6586927283. The cubic root of 53007991 is about 375.6474527624.

The spelling of 53007991 in words is "fifty-three million, seven thousand, nine hundred ninety-one".