121169661 has 4 divisors (see below), whose sum is σ = 161559552. Its totient is φ = 80779772.

The previous prime is 121169651. The next prime is 121169663. The reversal of 121169661 is 166961121.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 166961121 = 3 ⋅55653707.

It is a cyclic number.

It is not a de Polignac number, because 121169661 - 2¹⁰ = 121168637 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121169663) 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, 20194941 + ... + 20194946.

It is an arithmetic number, because the mean of its divisors is an integer number (40389888).

Almost surely, 2^121169661 is an apocalyptic number.

It is an amenable number.

121169661 is a deficient number, since it is larger than the sum of its proper divisors (40389891).

121169661 is an equidigital number, since it uses as much as digits as its factorization.

121169661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40389890.

The product of its digits is 3888, while the sum is 33.

The square root of 121169661 is about 11007.7091622190. The cubic root of 121169661 is about 494.8398094038.

The spelling of 121169661 in words is "one hundred twenty-one million, one hundred sixty-nine thousand, six hundred sixty-one".