99971253 has 20 divisors (see below), whose sum is σ = 151795468. Its totient is φ = 65551680.

The previous prime is 99971233. The next prime is 99971257. The reversal of 99971253 is 35217999.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 22496049 + 77475204 = 4743^2 + 8802^2 .

It is not a de Polignac number, because 99971253 - 2⁶ = 99971189 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 99971199 and 99971208.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (99971257) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 5176 + ... + 15057.

Almost surely, 2^99971253 is an apocalyptic number.

It is an amenable number.

99971253 is a deficient number, since it is larger than the sum of its proper divisors (51824215).

99971253 is a wasteful number, since it uses less digits than its factorization.

99971253 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20306 (or 20297 counting only the distinct ones).

The product of its digits is 153090, while the sum is 45.

The square root of 99971253 is about 9998.5625466864. The cubic root of 99971253 is about 464.1144018472.

The spelling of 99971253 in words is "ninety-nine million, nine hundred seventy-one thousand, two hundred fifty-three".