121751553641 has 4 divisors (see below), whose sum is σ = 121753713732. Its totient is φ = 121749393552.

The previous prime is 121751553631. The next prime is 121751553667. The reversal of 121751553641 is 146355157121.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 92839652416 + 28911901225 = 304696^2 + 170035^2 .

It is a cyclic number.

It is not a de Polignac number, because 121751553641 - 2³⁰ = 120677811817 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (121751553631) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 993170 + ... + 1109003.

It is an arithmetic number, because the mean of its divisors is an integer number (30438428433).

Almost surely, 2^121751553641 is an apocalyptic number.

It is an amenable number.

121751553641 is a deficient number, since it is larger than the sum of its proper divisors (2160091).

121751553641 is an equidigital number, since it uses as much as digits as its factorization.

121751553641 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2160090.

The product of its digits is 126000, while the sum is 41.

The spelling of 121751553641 in words is "one hundred twenty-one billion, seven hundred fifty-one million, five hundred fifty-three thousand, six hundred forty-one".