11515151231401 has 4 divisors (see below), whose sum is σ = 11518913126404. Its totient is φ = 11511389336400.

The previous prime is 11515151231359. The next prime is 11515151231417. The reversal of 11515151231401 is 10413215151511.

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

It can be written as a sum of positive squares in 2 ways, for example, as 10608856751376 + 906294480025 = 3257124^2 + 951995^2 .

It is a cyclic number.

It is not a de Polignac number, because 11515151231401 - 2²¹ = 11515149134249 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11515151231491) 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, 1880942910 + ... + 1880949031.

It is an arithmetic number, because the mean of its divisors is an integer number (2879728281601).

Almost surely, 2^{11515151231401} is an apocalyptic number.

It is an amenable number.

11515151231401 is a deficient number, since it is larger than the sum of its proper divisors (3761895003).

11515151231401 is an equidigital number, since it uses as much as digits as its factorization.

11515151231401 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3761895002.

The product of its (nonzero) digits is 3000, while the sum is 31.

Adding to 11515151231401 its reverse (10413215151511), we get a palindrome (21928366382912).

The spelling of 11515151231401 in words is "eleven trillion, five hundred fifteen billion, one hundred fifty-one million, two hundred thirty-one thousand, four hundred one".