1253631421 has 8 divisors (see below), whose sum is σ = 1433087360. Its totient is φ = 1074266928.

The previous prime is 1253631403. The next prime is 1253631461. The reversal of 1253631421 is 1241363521.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1253631421 - 2¹¹ = 1253629373 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1253631421.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1253631461) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9595 + ... + 50983.

It is an arithmetic number, because the mean of its divisors is an integer number (179135920).

Almost surely, 2^1253631421 is an apocalyptic number.

It is an amenable number.

1253631421 is a deficient number, since it is larger than the sum of its proper divisors (179455939).

1253631421 is an equidigital number, since it uses as much as digits as its factorization.

1253631421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45723.

The product of its digits is 4320, while the sum is 28.

The square root of 1253631421 is about 35406.6578626111. The cubic root of 1253631421 is about 1078.2594910578.

Adding to 1253631421 its reverse (1241363521), we get a palindrome (2494994942).

The spelling of 1253631421 in words is "one billion, two hundred fifty-three million, six hundred thirty-one thousand, four hundred twenty-one".