253217997 has 24 divisors (see below), whose sum is σ = 386204000. Its totient is φ = 159431328.

The previous prime is 253217969. The next prime is 253218001. The reversal of 253217997 is 799712352.

It is not a de Polignac number, because 253217997 - 2⁶ = 253217933 is a prime.

It is a Smith number, since the sum of its digits (45) coincides with the sum of the digits of its prime factors.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (253217917) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 57558 + ... + 61800.

Almost surely, 2^253217997 is an apocalyptic number.

It is an amenable number.

253217997 is a deficient number, since it is larger than the sum of its proper divisors (132986003).

253217997 is a wasteful number, since it uses less digits than its factorization.

253217997 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4617 (or 4614 counting only the distinct ones).

The product of its digits is 238140, while the sum is 45.

The square root of 253217997 is about 15912.8249220558. The cubic root of 253217997 is about 632.6519578442.

The spelling of 253217997 in words is "two hundred fifty-three million, two hundred seventeen thousand, nine hundred ninety-seven".