121007509 has 6 divisors (see below), whose sum is σ = 140763894. Its totient is φ = 103720680.

The previous prime is 121007503. The next prime is 121007521. The reversal of 121007509 is 905700121.

It can be written as a sum of positive squares in only one way, i.e., 64802500 + 56205009 = 8050^2 + 7497^2 .

It is not a de Polignac number, because 121007509 - 2¹⁹ = 120483221 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121007503) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1234722 + ... + 1234819.

It is an arithmetic number, because the mean of its divisors is an integer number (23460649).

Almost surely, 2^121007509 is an apocalyptic number.

It is an amenable number.

121007509 is a deficient number, since it is larger than the sum of its proper divisors (19756385).

121007509 is an equidigital number, since it uses as much as digits as its factorization.

121007509 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2469555 (or 2469548 counting only the distinct ones).

The product of its (nonzero) digits is 630, while the sum is 25.

The square root of 121007509 is about 11000.3413128866. The cubic root of 121007509 is about 494.6189755652.

The spelling of 121007509 in words is "one hundred twenty-one million, seven thousand, five hundred nine".