121557753 has 10 divisors (see below), whose sum is σ = 181586394. Its totient is φ = 81038448.

The previous prime is 121557697. The next prime is 121557773. The reversal of 121557753 is 357755121.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 95883264 + 25674489 = 9792^2 + 5067^2 .

It is not a de Polignac number, because 121557753 - 2¹⁴ = 121541369 is a prime.

It is not an unprimeable number, because it can be changed into a prime (121557773) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 750276 + ... + 750437.

Almost surely, 2^121557753 is an apocalyptic number.

It is an amenable number.

121557753 is a deficient number, since it is larger than the sum of its proper divisors (60028641).

121557753 is an equidigital number, since it uses as much as digits as its factorization.

121557753 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1500725 (or 1500716 counting only the distinct ones).

The product of its digits is 36750, while the sum is 36.

The square root of 121557753 is about 11025.3232605670. The cubic root of 121557753 is about 495.3675507077.

The spelling of 121557753 in words is "one hundred twenty-one million, five hundred fifty-seven thousand, seven hundred fifty-three".