121761542641 has 8 divisors (see below), whose sum is σ = 124064922024. Its totient is φ = 119458385280.

The previous prime is 121761542633. The next prime is 121761542653. The reversal of 121761542641 is 146245167121.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 4577875600 + 117183667041 = 67660^2 + 342321^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 121761542641 - 2³ = 121761542633 is a prime.

It is a super-2 number, since 2×121761542641² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 121761542594 and 121761542603.

It is not an unprimeable number, because it can be changed into a prime (121761542621) 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, 1417965 + ... + 1501381.

It is an arithmetic number, because the mean of its divisors is an integer number (15508115253).

Almost surely, 2^121761542641 is an apocalyptic number.

It is an amenable number.

121761542641 is a deficient number, since it is larger than the sum of its proper divisors (2303379383).

121761542641 is an equidigital number, since it uses as much as digits as its factorization.

121761542641 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 111011.

The product of its digits is 80640, while the sum is 40.

The spelling of 121761542641 in words is "one hundred twenty-one billion, seven hundred sixty-one million, five hundred forty-two thousand, six hundred forty-one".