253987969 has 3 divisors (see below), whose sum is σ = 254003907. Its totient is φ = 253972032.

The previous prime is 253987967. The next prime is 253987997. The reversal of 253987969 is 969789352.

The square root of 253987969 is 15937.

It is a perfect power (a square), and thus also a powerful number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in only one way, i.e., 178089025 + 75898944 = 13345^2 + 8712^2 .

It is not a de Polignac number, because 253987969 - 2¹ = 253987967 is a prime.

It is a super-2 number, since 2×253987969² = 129019776793489922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (253987967) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 7969 + ... + 23905.

It is an arithmetic number, because the mean of its divisors is an integer number (84667969).

Almost surely, 2^253987969 is an apocalyptic number.

253987969 is the 15937-th square number.

253987969 is the 7969-th centered octagonal number.

It is an amenable number.

253987969 is a deficient number, since it is larger than the sum of its proper divisors (15938).

253987969 is an frugal number, since it uses more digits than its factorization.

253987969 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31874 (or 15937 counting only the distinct ones).

The product of its digits is 7348320, while the sum is 58.

The cubic root of 253987969 is about 633.2925539456.

The spelling of 253987969 in words is "two hundred fifty-three million, nine hundred eighty-seven thousand, nine hundred sixty-nine".