121663501 has 2 divisors, whose sum is σ = 121663502. Its totient is φ = 121663500.

The previous prime is 121663481. The next prime is 121663547. The reversal of 121663501 is 105366121.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 121660900 + 2601 = 11030^2 + 51^2 .

It is a cyclic number.

It is not a de Polignac number, because 121663501 - 2¹⁷ = 121532429 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (121663571) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60831750 + 60831751.

It is an arithmetic number, because the mean of its divisors is an integer number (60831751).

Almost surely, 2^121663501 is an apocalyptic number.

It is an amenable number.

121663501 is a deficient number, since it is larger than the sum of its proper divisors (1).

121663501 is an equidigital number, since it uses as much as digits as its factorization.

121663501 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1080, while the sum is 25.

The square root of 121663501 is about 11030.1179050815. The cubic root of 121663501 is about 495.5111558212.

The spelling of 121663501 in words is "one hundred twenty-one million, six hundred sixty-three thousand, five hundred one".