1253621343 has 32 divisors (see below), whose sum is σ = 1824076800. Its totient is φ = 761230080.

The previous prime is 1253621333. The next prime is 1253621351. The reversal of 1253621343 is 3431263521.

It is a de Polignac number, because none of the positive numbers 2^k-1253621343 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1253621343.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1253621333) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2092558 + ... + 2093156.

It is an arithmetic number, because the mean of its divisors is an integer number (57002400).

Almost surely, 2^1253621343 is an apocalyptic number.

1253621343 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

1253621343 is a deficient number, since it is larger than the sum of its proper divisors (570455457).

1253621343 is a wasteful number, since it uses less digits than its factorization.

1253621343 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1239.

The product of its digits is 12960, while the sum is 30.

The square root of 1253621343 is about 35406.5155444588. The cubic root of 1253621343 is about 1078.2566016577.

Adding to 1253621343 its reverse (3431263521), we get a palindrome (4684884864).

The spelling of 1253621343 in words is "one billion, two hundred fifty-three million, six hundred twenty-one thousand, three hundred forty-three".