251454545411 has 4 divisors (see below), whose sum is σ = 251564786424. Its totient is φ = 251344304400.

The previous prime is 251454545393. The next prime is 251454545423. The reversal of 251454545411 is 114545454152.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-251454545411 is a prime.

It is a super-2 number, since 2×251454545411² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (251454545431) 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, 55117085 + ... + 55121646.

It is an arithmetic number, because the mean of its divisors is an integer number (62891196606).

Almost surely, 2^251454545411 is an apocalyptic number.

251454545411 is a deficient number, since it is larger than the sum of its proper divisors (110241013).

251454545411 is a wasteful number, since it uses less digits than its factorization.

251454545411 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 110241012.

The product of its digits is 320000, while the sum is 41.

Adding to 251454545411 its reverse (114545454152), we get a palindrome (365999999563).

The spelling of 251454545411 in words is "two hundred fifty-one billion, four hundred fifty-four million, five hundred forty-five thousand, four hundred eleven".