121740281569 has 9 divisors (see below), whose sum is σ = 122193101809. Its totient is φ = 121289137060.

The previous prime is 121740281473. The next prime is 121740281603. The reversal of 121740281569 is 965182047121.

The square root of 121740281569 is 348913.

It is a perfect power (a square), and thus also a powerful number.

It is not a de Polignac number, because 121740281569 - 2⁹ = 121740281057 is a prime.

It is a super-2 number, since 2×121740281569² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (121740281869) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 133633224 + ... + 133634134.

Almost surely, 2^121740281569 is an apocalyptic number.

121740281569 is the 348913-rd square number.

121740281569 is the 174457-th centered octagonal number.

It is an amenable number.

121740281569 is a deficient number, since it is larger than the sum of its proper divisors (452820240).

121740281569 is an frugal number, since it uses more digits than its factorization.

121740281569 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2588 (or 1294 counting only the distinct ones).

The product of its (nonzero) digits is 241920, while the sum is 46.

The spelling of 121740281569 in words is "one hundred twenty-one billion, seven hundred forty million, two hundred eighty-one thousand, five hundred sixty-nine".