121261557 has 16 divisors (see below), whose sum is σ = 167618880. Its totient is φ = 77884800.

The previous prime is 121261549. The next prime is 121261573. The reversal of 121261557 is 755162121.

It is not a de Polignac number, because 121261557 - 2³ = 121261549 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121261157) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 48457 + ... + 50897.

It is an arithmetic number, because the mean of its divisors is an integer number (10476180).

Almost surely, 2^121261557 is an apocalyptic number.

It is an amenable number.

121261557 is a deficient number, since it is larger than the sum of its proper divisors (46357323).

121261557 is a wasteful number, since it uses less digits than its factorization.

121261557 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3044.

The product of its digits is 4200, while the sum is 30.

The square root of 121261557 is about 11011.8825366056. The cubic root of 121261557 is about 494.9648745609.

The spelling of 121261557 in words is "one hundred twenty-one million, two hundred sixty-one thousand, five hundred fifty-seven".