121642651 has 6 divisors (see below), whose sum is σ = 131719740. Its totient is φ = 112285368.

The previous prime is 121642649. The next prime is 121642681. The reversal of 121642651 is 156246121.

It is not a de Polignac number, because 121642651 - 2¹ = 121642649 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (121642621) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 359721 + ... + 360058.

It is an arithmetic number, because the mean of its divisors is an integer number (21953290).

Almost surely, 2^121642651 is an apocalyptic number.

121642651 is a deficient number, since it is larger than the sum of its proper divisors (10077089).

121642651 is an equidigital number, since it uses as much as digits as its factorization.

121642651 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 719805 (or 719792 counting only the distinct ones).

The product of its digits is 2880, while the sum is 28.

The square root of 121642651 is about 11029.1727250959. The cubic root of 121642651 is about 495.4828482412.

Adding to 121642651 its reverse (156246121), we get a palindrome (277888772).

The spelling of 121642651 in words is "one hundred twenty-one million, six hundred forty-two thousand, six hundred fifty-one".