231515445211101 has 12 divisors (see below), whose sum is σ = 354082445617212. Its totient is φ = 145264593073536.

The previous prime is 231515445211019. The next prime is 231515445211109. The reversal of 231515445211101 is 101112544515132.

It is a happy number.

231515445211101 is a `hidden beast` number, since 2 + 3 + 1 + 5 + 1 + 544 + 5 + 2 + 1 + 1 + 101 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 210973475305476 + 20541969905625 = 14524926^2 + 4532325^2 .

It is not a de Polignac number, because 231515445211101 - 2³³ = 231506855276509 is a prime.

It is a super-4 number, since 4×231515445211101⁴ (a number of 59 digits) contains 4444 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (231515445211109) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 756586422106 + ... + 756586422411.

It is an arithmetic number, because the mean of its divisors is an integer number (29506870468101).

Almost surely, 2^{231515445211101} is an apocalyptic number.

It is an amenable number.

231515445211101 is a deficient number, since it is larger than the sum of its proper divisors (122567000406111).

231515445211101 is a wasteful number, since it uses less digits than its factorization.

231515445211101 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1513172844540 (or 1513172844537 counting only the distinct ones).

The product of its (nonzero) digits is 24000, while the sum is 36.

Adding to 231515445211101 its reverse (101112544515132), we get a palindrome (332627989726233).

The spelling of 231515445211101 in words is "two hundred thirty-one trillion, five hundred fifteen billion, four hundred forty-five million, two hundred eleven thousand, one hundred one".