121632261 has 4 divisors (see below), whose sum is σ = 162176352. Its totient is φ = 81088172.

The previous prime is 121632253. The next prime is 121632307. The reversal of 121632261 is 162236121.

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.

It is a cyclic number.

It is not a de Polignac number, because 121632261 - 2³ = 121632253 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121632361) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 20272041 + ... + 20272046.

It is an arithmetic number, because the mean of its divisors is an integer number (40544088).

Almost surely, 2^121632261 is an apocalyptic number.

It is an amenable number.

121632261 is a deficient number, since it is larger than the sum of its proper divisors (40544091).

121632261 is an equidigital number, since it uses as much as digits as its factorization.

121632261 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40544090.

The product of its digits is 864, while the sum is 24.

The square root of 121632261 is about 11028.7016914957. The cubic root of 121632261 is about 495.4687407624.

Adding to 121632261 its reverse (162236121), we get a palindrome (283868382).

The spelling of 121632261 in words is "one hundred twenty-one million, six hundred thirty-two thousand, two hundred sixty-one".