121252545 has 20 divisors (see below), whose sum is σ = 217357140. Its totient is φ = 64667808.

The previous prime is 121252543. The next prime is 121252553. The reversal of 121252545 is 545252121.

It can be written as a sum of positive squares in 2 ways, for example, as 82464561 + 38787984 = 9081^2 + 6228^2 .

It is not a de Polignac number, because 121252545 - 2¹ = 121252543 is a prime.

It is a super-3 number, since 3×121252545³ (a number of 25 digits) contains 333 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is an alternating number because its digits alternate between odd and even.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (121252541) 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 19 ways as a sum of consecutive naturals, for example, 149290 + ... + 150099.

It is an arithmetic number, because the mean of its divisors is an integer number (10867857).

Almost surely, 2^121252545 is an apocalyptic number.

121252545 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

121252545 is a deficient number, since it is larger than the sum of its proper divisors (96104595).

121252545 is an equidigital number, since it uses as much as digits as its factorization.

121252545 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 299406 (or 299397 counting only the distinct ones).

The product of its digits is 4000, while the sum is 27.

The square root of 121252545 is about 11011.4733346633. The cubic root of 121252545 is about 494.9526125435.

The spelling of 121252545 in words is "one hundred twenty-one million, two hundred fifty-two thousand, five hundred forty-five".