121550919 has 24 divisors (see below), whose sum is σ = 195035760. Its totient is φ = 67060224.

The previous prime is 121550917. The next prime is 121550939. The reversal of 121550919 is 919055121.

It is a happy number.

It is not a de Polignac number, because 121550919 - 2¹ = 121550917 is a prime.

It is a super-2 number, since 2×121550919² = 29549251819489122, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 121550919.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121550917) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 9994 + ... + 18519.

It is an arithmetic number, because the mean of its divisors is an integer number (8126490).

Almost surely, 2^121550919 is an apocalyptic number.

121550919 is a deficient number, since it is larger than the sum of its proper divisors (73484841).

121550919 is a wasteful number, since it uses less digits than its factorization.

121550919 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28559 (or 28552 counting only the distinct ones).

The product of its (nonzero) digits is 4050, while the sum is 33.

The square root of 121550919 is about 11025.0133333253. The cubic root of 121550919 is about 495.3582673144.

The spelling of 121550919 in words is "one hundred twenty-one million, five hundred fifty thousand, nine hundred nineteen".