121537541985 has 16 divisors (see below), whose sum is σ = 194762508864. Its totient is φ = 64719208512.

The previous prime is 121537541971. The next prime is 121537541999. The reversal of 121537541985 is 589145735121.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (121537541971) and next prime (121537541999).

It is not a de Polignac number, because 121537541985 - 2⁵ = 121537541953 is a prime.

It is a super-2 number, since 2×121537541985² (a number of 23 digits) contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6290902 + ... + 6310191.

It is an arithmetic number, because the mean of its divisors is an integer number (12172656804).

Almost surely, 2^121537541985 is an apocalyptic number.

121537541985 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

121537541985 is a deficient number, since it is larger than the sum of its proper divisors (73224966879).

121537541985 is a wasteful number, since it uses less digits than its factorization.

121537541985 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12601744.

The product of its digits is 1512000, while the sum is 51.

The spelling of 121537541985 in words is "one hundred twenty-one billion, five hundred thirty-seven million, five hundred forty-one thousand, nine hundred eighty-five".