1253168381 has 4 divisors (see below), whose sum is σ = 1259729664. Its totient is φ = 1246607100.

The previous prime is 1253168359. The next prime is 1253168383. The reversal of 1253168381 is 1838613521.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 1838613521 = 25849 ⋅71129.

It is a cyclic number.

It is not a de Polignac number, because 1253168381 - 2²⁶ = 1186059517 is a prime.

It is a super-2 number, since 2×1253168381² = 3140861982276322322, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1253168383) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3280355 + ... + 3280736.

It is an arithmetic number, because the mean of its divisors is an integer number (314932416).

Almost surely, 2^1253168381 is an apocalyptic number.

It is an amenable number.

1253168381 is a deficient number, since it is larger than the sum of its proper divisors (6561283).

1253168381 is an equidigital number, since it uses as much as digits as its factorization.

1253168381 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6561282.

The product of its digits is 34560, while the sum is 38.

The square root of 1253168381 is about 35400.1183755083. The cubic root of 1253168381 is about 1078.1267197743.

The spelling of 1253168381 in words is "one billion, two hundred fifty-three million, one hundred sixty-eight thousand, three hundred eighty-one".