121641455 has 16 divisors (see below), whose sum is σ = 158733120. Its totient is φ = 88950528.

The previous prime is 121641431. The next prime is 121641463. The reversal of 121641455 is 554146121.

It is a cyclic number.

It is not a de Polignac number, because 121641455 - 2⁸ = 121641199 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2390 + ... + 15779.

It is an arithmetic number, because the mean of its divisors is an integer number (9920820).

Almost surely, 2^121641455 is an apocalyptic number.

121641455 is a deficient number, since it is larger than the sum of its proper divisors (37091665).

121641455 is a wasteful number, since it uses less digits than its factorization.

121641455 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18290.

The product of its digits is 4800, while the sum is 29.

The square root of 121641455 is about 11029.1185051209. The cubic root of 121641455 is about 495.4812243606.

Adding to 121641455 its reverse (554146121), we get a palindrome (675787576).

The spelling of 121641455 in words is "one hundred twenty-one million, six hundred forty-one thousand, four hundred fifty-five".