140121555 has 16 divisors (see below), whose sum is σ = 256222464. Its totient is φ = 64055520.

The previous prime is 140121551. The next prime is 140121557. The reversal of 140121555 is 555121041.

It is not a de Polignac number, because 140121555 - 2² = 140121551 is a prime.

It is not an unprimeable number, because it can be changed into a prime (140121551) 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 15 ways as a sum of consecutive naturals, for example, 667141 + ... + 667350.

It is an arithmetic number, because the mean of its divisors is an integer number (16013904).

Almost surely, 2^140121555 is an apocalyptic number.

140121555 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

140121555 is a deficient number, since it is larger than the sum of its proper divisors (116100909).

140121555 is a wasteful number, since it uses less digits than its factorization.

140121555 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1334506.

The product of its (nonzero) digits is 1000, while the sum is 24.

The square root of 140121555 is about 11837.2950879836. The cubic root of 140121555 is about 519.3996461462.

Adding to 140121555 its reverse (555121041), we get a palindrome (695242596).

The spelling of 140121555 in words is "one hundred forty million, one hundred twenty-one thousand, five hundred fifty-five".