121550961 has 32 divisors (see below), whose sum is σ = 195747840. Its totient is φ = 65539584.

The previous prime is 121550951. The next prime is 121550963. The reversal of 121550961 is 169055121.

It is not a de Polignac number, because 121550961 - 2¹¹ = 121548913 is a prime.

It is a super-2 number, since 2×121550961² = 29549272240047042, which contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (121550963) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 140416 + ... + 141278.

It is an arithmetic number, because the mean of its divisors is an integer number (6117120).

Almost surely, 2^121550961 is an apocalyptic number.

It is an amenable number.

121550961 is a deficient number, since it is larger than the sum of its proper divisors (74196879).

121550961 is a wasteful number, since it uses less digits than its factorization.

121550961 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1245.

The product of its (nonzero) digits is 2700, while the sum is 30.

The square root of 121550961 is about 11025.0152380847. The cubic root of 121550961 is about 495.3583243688.

The spelling of 121550961 in words is "one hundred twenty-one million, five hundred fifty thousand, nine hundred sixty-one".