121661524 has 12 divisors (see below), whose sum is σ = 212987124. Its totient is φ = 60808064.

The previous prime is 121661459. The next prime is 121661531. The reversal of 121661524 is 425166121.

It can be written as a sum of positive squares in 2 ways, for example, as 42771600 + 78889924 = 6540^2 + 8882^2 .

It is a junction number, because it is equal to n+sod(n) for n = 121661492 and 121661501.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13842 + ... + 20854.

It is an arithmetic number, because the mean of its divisors is an integer number (17748927).

Almost surely, 2^121661524 is an apocalyptic number.

It is an amenable number.

121661524 is a deficient number, since it is larger than the sum of its proper divisors (91325600).

121661524 is a wasteful number, since it uses less digits than its factorization.

121661524 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11354 (or 11352 counting only the distinct ones).

The product of its digits is 2880, while the sum is 28.

The square root of 121661524 is about 11030.0282864551. The cubic root of 121661524 is about 495.5084718312.

The spelling of 121661524 in words is "one hundred twenty-one million, six hundred sixty-one thousand, five hundred twenty-four".