122345732131561 has 4 divisors (see below), whose sum is σ = 122366535696724. Its totient is φ = 122324928566400.

The previous prime is 122345732131559. The next prime is 122345732131573. The reversal of 122345732131561 is 165131237543221.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 107246632440025 + 15099099691536 = 10355995^2 + 3885756^2 .

It is a cyclic number.

It is not a de Polignac number, because 122345732131561 - 2¹ = 122345732131559 is a prime.

It is a super-2 number, since 2×122345732131561² (a number of 29 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (122345732131541) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10401773760 + ... + 10401785521.

It is an arithmetic number, because the mean of its divisors is an integer number (30591633924181).

Almost surely, 2^{122345732131561} is an apocalyptic number.

It is an amenable number.

122345732131561 is a deficient number, since it is larger than the sum of its proper divisors (20803565163).

122345732131561 is an equidigital number, since it uses as much as digits as its factorization.

122345732131561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20803565162.

The product of its digits is 907200, while the sum is 46.

Adding to 122345732131561 its reverse (165131237543221), we get a palindrome (287476969674782).

The spelling of 122345732131561 in words is "one hundred twenty-two trillion, three hundred forty-five billion, seven hundred thirty-two million, one hundred thirty-one thousand, five hundred sixty-one".