991253953 has 2 divisors, whose sum is σ = 991253954. Its totient is φ = 991253952.

The previous prime is 991253917. The next prime is 991253981. The reversal of 991253953 is 359352199.

991253953 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 803892609 + 187361344 = 28353^2 + 13688^2 .

It is a cyclic number.

It is not a de Polignac number, because 991253953 - 2⁹ = 991253441 is a prime.

It is not a weakly prime, because it can be changed into another prime (991253993) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 495626976 + 495626977.

It is an arithmetic number, because the mean of its divisors is an integer number (495626977).

Almost surely, 2^991253953 is an apocalyptic number.

It is an amenable number.

991253953 is a deficient number, since it is larger than the sum of its proper divisors (1).

991253953 is an equidigital number, since it uses as much as digits as its factorization.

991253953 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 328050, while the sum is 46.

The square root of 991253953 is about 31484.1857604735. The cubic root of 991253953 is about 997.0761102007.

The spelling of 991253953 in words is "nine hundred ninety-one million, two hundred fifty-three thousand, nine hundred fifty-three".