1253421543 has 32 divisors (see below), whose sum is σ = 1992701952. Its totient is φ = 691891200.

The previous prime is 1253421541. The next prime is 1253421551. The reversal of 1253421543 is 3451243521.

It is not a de Polignac number, because 1253421543 - 2¹ = 1253421541 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1253421543.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1253421541) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 18646 + ... + 53427.

It is an arithmetic number, because the mean of its divisors is an integer number (62271936).

Almost surely, 2^1253421543 is an apocalyptic number.

1253421543 is a deficient number, since it is larger than the sum of its proper divisors (739280409).

1253421543 is a wasteful number, since it uses less digits than its factorization.

1253421543 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 72135.

The product of its digits is 14400, while the sum is 30.

The square root of 1253421543 is about 35403.6939174431. The cubic root of 1253421543 is about 1078.1993150571.

The spelling of 1253421543 in words is "one billion, two hundred fifty-three million, four hundred twenty-one thousand, five hundred forty-three".