1253439265481 has 8 divisors (see below), whose sum is σ = 1368348872520. Its totient is φ = 1141171258752.

The previous prime is 1253439265439. The next prime is 1253439265489. The reversal of 1253439265481 is 1845629343521.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 406809249856 + 846630015625 = 637816^2 + 920125^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 1253439265481 - 2⁶ = 1253439265417 is a prime.

It is a super-2 number, since 2×1253439265481² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1253439265489) 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, 660399086 + ... + 660400983.

It is an arithmetic number, because the mean of its divisors is an integer number (171043609065).

Almost surely, 2^{1253439265481} is an apocalyptic number.

It is an amenable number.

1253439265481 is a deficient number, since it is larger than the sum of its proper divisors (114909607039).

1253439265481 is a wasteful number, since it uses less digits than its factorization.

1253439265481 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1320800155.

The product of its digits is 6220800, while the sum is 53.

The spelling of 1253439265481 in words is "one trillion, two hundred fifty-three billion, four hundred thirty-nine million, two hundred sixty-five thousand, four hundred eighty-one".