121661501 has 8 divisors (see below), whose sum is σ = 132679680. Its totient is φ = 110880432.

The previous prime is 121661459. The next prime is 121661531. The reversal of 121661501 is 105166121.

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

It is not a de Polignac number, because 121661501 - 2¹⁸ = 121399357 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121661531) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 58205 + ... + 60258.

It is an arithmetic number, because the mean of its divisors is an integer number (16584960).

Almost surely, 2^121661501 is an apocalyptic number.

It is an amenable number.

121661501 is a deficient number, since it is larger than the sum of its proper divisors (11018179).

121661501 is a wasteful number, since it uses less digits than its factorization.

121661501 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 118555.

The product of its (nonzero) digits is 360, while the sum is 23.

The square root of 121661501 is about 11030.0272438467. The cubic root of 121661501 is about 495.5084406060.

The spelling of 121661501 in words is "one hundred twenty-one million, six hundred sixty-one thousand, five hundred one".