121555534 has 8 divisors (see below), whose sum is σ = 182410128. Its totient is φ = 60752160.

The previous prime is 121555519. The next prime is 121555537. The reversal of 121555534 is 435555121.

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

It is a junction number, because it is equal to n+sod(n) for n = 121555496 and 121555505.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121555537) 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, 6187 + ... + 16774.

It is an arithmetic number, because the mean of its divisors is an integer number (22801266).

Almost surely, 2^121555534 is an apocalyptic number.

121555534 is a deficient number, since it is larger than the sum of its proper divisors (60854594).

121555534 is a wasteful number, since it uses less digits than its factorization.

121555534 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25610.

The product of its digits is 15000, while the sum is 31.

The square root of 121555534 is about 11025.2226281377. Note that the first 3 decimals coincide. The cubic root of 121555534 is about 495.3645364278.

It can be divided in two parts, 12155 and 5534, that added together give a square (17689 = 133²).

The spelling of 121555534 in words is "one hundred twenty-one million, five hundred fifty-five thousand, five hundred thirty-four".