11531251001 has 4 divisors (see below), whose sum is σ = 11534522100. Its totient is φ = 11527979904.

The previous prime is 11531250931. The next prime is 11531251019. The reversal of 11531251001 is 10015213511.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 10015213511 = 599 ⋅16719889.

It can be written as a sum of positive squares in 2 ways, for example, as 2410810000 + 9120441001 = 49100^2 + 95501^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-11531251001 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11531253001) 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 3 ways as a sum of consecutive naturals, for example, 1630256 + ... + 1637313.

It is an arithmetic number, because the mean of its divisors is an integer number (2883630525).

Almost surely, 2^11531251001 is an apocalyptic number.

It is an amenable number.

11531251001 is a deficient number, since it is larger than the sum of its proper divisors (3271099).

11531251001 is an equidigital number, since it uses as much as digits as its factorization.

11531251001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3271098.

The product of its (nonzero) digits is 150, while the sum is 20.

Adding to 11531251001 its reverse (10015213511), we get a palindrome (21546464512).

The spelling of 11531251001 in words is "eleven billion, five hundred thirty-one million, two hundred fifty-one thousand, one".