121557133 has 2 divisors, whose sum is σ = 121557134. Its totient is φ = 121557132.

The previous prime is 121557131. The next prime is 121557187. The reversal of 121557133 is 331755121.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 115734564 + 5822569 = 10758^2 + 2413^2 .

It is an emirp because it is prime and its reverse (331755121) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 121557133 - 2¹ = 121557131 is a prime.

It is a super-2 number, since 2×121557133² = 29552273166359378, which contains 22 as substring.

Together with 121557131, it forms a pair of twin primes.

It is a zygodrome in base 15.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (121557131) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60778566 + 60778567.

It is an arithmetic number, because the mean of its divisors is an integer number (60778567).

Almost surely, 2^121557133 is an apocalyptic number.

It is an amenable number.

121557133 is a deficient number, since it is larger than the sum of its proper divisors (1).

121557133 is an equidigital number, since it uses as much as digits as its factorization.

121557133 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3150, while the sum is 28.

The square root of 121557133 is about 11025.2951434417. The cubic root of 121557133 is about 495.3667085061.

The spelling of 121557133 in words is "one hundred twenty-one million, five hundred fifty-seven thousand, one hundred thirty-three".