121147865 has 16 divisors (see below), whose sum is σ = 155303568. Its totient is φ = 90402816.

The previous prime is 121147853. The next prime is 121147909. The reversal of 121147865 is 568741121.

It can be written as a sum of positive squares in 8 ways, for example, as 9803161 + 111344704 = 3131^2 + 10552^2 .

It is a cyclic number.

It is not a de Polignac number, because 121147865 - 2⁴ = 121147849 is a prime.

It is a super-3 number, since 3×121147865³ (a number of 25 digits) contains 333 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3299 + ... + 15911.

It is an arithmetic number, because the mean of its divisors is an integer number (9706473).

Almost surely, 2^121147865 is an apocalyptic number.

It is an amenable number.

121147865 is a deficient number, since it is larger than the sum of its proper divisors (34155703).

121147865 is a wasteful number, since it uses less digits than its factorization.

121147865 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12748.

The product of its digits is 13440, while the sum is 35.

The square root of 121147865 is about 11006.7190842685. The cubic root of 121147865 is about 494.8101370277.

Adding to 121147865 its reverse (568741121), we get a palindrome (689888986).

The spelling of 121147865 in words is "one hundred twenty-one million, one hundred forty-seven thousand, eight hundred sixty-five".