121431554 has 8 divisors (see below), whose sum is σ = 182498508. Its totient is φ = 60598720.

The previous prime is 121431553. The next prime is 121431587. The reversal of 121431554 is 455134121.

It can be written as a sum of positive squares in 2 ways, for example, as 114811225 + 6620329 = 10715^2 + 2573^2 .

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

It is not an unprimeable number, because it can be changed into a prime (121431551) 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 3 ways as a sum of consecutive naturals, for example, 57227 + ... + 59310.

Almost surely, 2^121431554 is an apocalyptic number.

121431554 is a deficient number, since it is larger than the sum of its proper divisors (61066954).

121431554 is a wasteful number, since it uses less digits than its factorization.

121431554 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 117060.

The product of its digits is 2400, while the sum is 26.

The square root of 121431554 is about 11019.5986315292. The cubic root of 121431554 is about 495.1960642211.

Adding to 121431554 its reverse (455134121), we get a palindrome (576565675).

It can be divided in two parts, 1214 and 31554, that added together give a 15-th power (32768 = 2¹⁵).

The spelling of 121431554 in words is "one hundred twenty-one million, four hundred thirty-one thousand, five hundred fifty-four".