131220035564 has 24 divisors (see below), whose sum is σ = 233625963648. Its totient is φ = 64471847040.

The previous prime is 131220035543. The next prime is 131220035567. The reversal of 131220035564 is 465530022131.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 131220035564.

It is not an unprimeable number, because it can be changed into a prime (131220035567) 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, 8252 + ... + 512355.

It is an arithmetic number, because the mean of its divisors is an integer number (9734415152).

Almost surely, 2^131220035564 is an apocalyptic number.

It is an amenable number.

131220035564 is a deficient number, since it is larger than the sum of its proper divisors (102405928084).

131220035564 is a wasteful number, since it uses less digits than its factorization.

131220035564 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 521705 (or 521703 counting only the distinct ones).

The product of its (nonzero) digits is 21600, while the sum is 32.

Adding to 131220035564 its reverse (465530022131), we get a palindrome (596750057695).

The spelling of 131220035564 in words is "one hundred thirty-one billion, two hundred twenty million, thirty-five thousand, five hundred sixty-four".