101231511540 has 24 divisors (see below), whose sum is σ = 283448232480. Its totient is φ = 26995069728.

The previous prime is 101231511497. The next prime is 101231511547. The reversal of 101231511540 is 45115132101.

It is a self number, because there is not a number n which added to its sum of digits gives 101231511540.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (101231511547) 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, 843595870 + ... + 843595989.

It is an arithmetic number, because the mean of its divisors is an integer number (11810343020).

Almost surely, 2^101231511540 is an apocalyptic number.

101231511540 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

101231511540 is an abundant number, since it is smaller than the sum of its proper divisors (182216720940).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

101231511540 is a wasteful number, since it uses less digits than its factorization.

101231511540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1687191871 (or 1687191869 counting only the distinct ones).

The product of its (nonzero) digits is 600, while the sum is 24.

Adding to 101231511540 its reverse (45115132101), we get a palindrome (146346643641).

The spelling of 101231511540 in words is "one hundred one billion, two hundred thirty-one million, five hundred eleven thousand, five hundred forty".