121311557 has 8 divisors (see below), whose sum is σ = 124296480. Its totient is φ = 118334160.

The previous prime is 121311551. The next prime is 121311581. The reversal of 121311557 is 755113121.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 121311557 - 2¹⁸ = 121049413 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121311551) 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 7 ways as a sum of consecutive naturals, for example, 44294 + ... + 46952.

It is an arithmetic number, because the mean of its divisors is an integer number (15537060).

Almost surely, 2^121311557 is an apocalyptic number.

It is an amenable number.

121311557 is a deficient number, since it is larger than the sum of its proper divisors (2984923).

121311557 is a wasteful number, since it uses less digits than its factorization.

121311557 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3763.

The product of its digits is 1050, while the sum is 26.

The square root of 121311557 is about 11014.1525774796. The cubic root of 121311557 is about 495.0328951373.

Adding to 121311557 its reverse (755113121), we get a palindrome (876424678).

The spelling of 121311557 in words is "one hundred twenty-one million, three hundred eleven thousand, five hundred fifty-seven".