1231542210501 has 20 divisors (see below), whose sum is σ = 1936538111200. Its totient is φ = 777816131976.

The previous prime is 1231542210443. The next prime is 1231542210601. The reversal of 1231542210501 is 1050122451321.

It is a happy number.

1231542210501 is a `hidden beast` number, since 1 + 2 + 3 + 154 + 2 + 2 + 1 + 0 + 501 = 666.

It is not a de Polignac number, because 1231542210501 - 2²⁹ = 1231005339589 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1231542210601) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 400109641 + ... + 400112718.

It is an arithmetic number, because the mean of its divisors is an integer number (96826905560).

Almost surely, 2^{1231542210501} is an apocalyptic number.

It is an amenable number.

1231542210501 is a deficient number, since it is larger than the sum of its proper divisors (704995900699).

1231542210501 is an equidigital number, since it uses as much as digits as its factorization.

1231542210501 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 800222390 (or 800222381 counting only the distinct ones).

The product of its (nonzero) digits is 2400, while the sum is 27.

Adding to 1231542210501 its reverse (1050122451321), we get a palindrome (2281664661822).

The spelling of 1231542210501 in words is "one trillion, two hundred thirty-one billion, five hundred forty-two million, two hundred ten thousand, five hundred one".