121550625281 has 4 divisors (see below), whose sum is σ = 122054984964. Its totient is φ = 121046265600.

The previous prime is 121550625271. The next prime is 121550625319. The reversal of 121550625281 is 182526055121.

It is a happy number.

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 91330279681 + 30220345600 = 302209^2 + 173840^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-121550625281 is a prime.

It is a super-2 number, since 2×121550625281² (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 (121550625271) 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, 252179480 + ... + 252179961.

It is an arithmetic number, because the mean of its divisors is an integer number (30513746241).

Almost surely, 2^121550625281 is an apocalyptic number.

It is an amenable number.

121550625281 is a deficient number, since it is larger than the sum of its proper divisors (504359683).

121550625281 is an equidigital number, since it uses as much as digits as its factorization.

121550625281 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 504359682.

The product of its (nonzero) digits is 48000, while the sum is 38.

The spelling of 121550625281 in words is "one hundred twenty-one billion, five hundred fifty million, six hundred twenty-five thousand, two hundred eighty-one".