121263765 has 16 divisors (see below), whose sum is σ = 221739648. Its totient is φ = 55434816.

The previous prime is 121263749. The next prime is 121263767. The reversal of 121263765 is 567362121.

It is not a de Polignac number, because 121263765 - 2⁴ = 121263749 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121263767) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 577342 + ... + 577551.

It is an arithmetic number, because the mean of its divisors is an integer number (13858728).

Almost surely, 2^121263765 is an apocalyptic number.

121263765 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

121263765 is a deficient number, since it is larger than the sum of its proper divisors (100475883).

121263765 is a wasteful number, since it uses less digits than its factorization.

121263765 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1154908.

The product of its digits is 15120, while the sum is 33.

The square root of 121263765 is about 11011.9827914867. The cubic root of 121263765 is about 494.9678787441.

The spelling of 121263765 in words is "one hundred twenty-one million, two hundred sixty-three thousand, seven hundred sixty-five".