121640453 has 6 divisors (see below), whose sum is σ = 133704102. Its totient is φ = 110582120.

The previous prime is 121640437. The next prime is 121640509. The reversal of 121640453 is 354046121.

It can be written as a sum of positive squares in only one way, i.e., 114554209 + 7086244 = 10703^2 + 2662^2 .

It is not a de Polignac number, because 121640453 - 2⁴ = 121640437 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121646453) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 502526 + ... + 502767.

It is an arithmetic number, because the mean of its divisors is an integer number (22284017).

Almost surely, 2^121640453 is an apocalyptic number.

It is an amenable number.

121640453 is a deficient number, since it is larger than the sum of its proper divisors (12063649).

121640453 is a wasteful number, since it uses less digits than its factorization.

121640453 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1005315 (or 1005304 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 26.

The square root of 121640453 is about 11029.0730798195. The cubic root of 121640453 is about 495.4798638772.

Adding to 121640453 its reverse (354046121), we get a palindrome (475686574).

The spelling of 121640453 in words is "one hundred twenty-one million, six hundred forty thousand, four hundred fifty-three".