121281645 has 32 divisors (see below), whose sum is σ = 203212800. Its totient is φ = 61649984.

The previous prime is 121281637. The next prime is 121281659. The reversal of 121281645 is 546182121.

It is not a de Polignac number, because 121281645 - 2³ = 121281637 is a prime.

It is a super-3 number, since 3×121281645³ (a number of 25 digits) contains 333 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 144136 + ... + 144974.

It is an arithmetic number, because the mean of its divisors is an integer number (6350400).

Almost surely, 2^121281645 is an apocalyptic number.

121281645 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

121281645 is a deficient number, since it is larger than the sum of its proper divisors (81931155).

121281645 is a wasteful number, since it uses less digits than its factorization.

121281645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1289.

The product of its digits is 3840, while the sum is 30.

The square root of 121281645 is about 11012.7946044589. The cubic root of 121281645 is about 494.9922047543.

The spelling of 121281645 in words is "one hundred twenty-one million, two hundred eighty-one thousand, six hundred forty-five".