121745261 has 16 divisors (see below), whose sum is σ = 136382400. Its totient is φ = 107740800.

The previous prime is 121745251. The next prime is 121745263. The reversal of 121745261 is 162547121.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-121745261 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121745263) 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, 69881 + ... + 71601.

It is an arithmetic number, because the mean of its divisors is an integer number (8523900).

Almost surely, 2^121745261 is an apocalyptic number.

121745261 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

121745261 is a deficient number, since it is larger than the sum of its proper divisors (14637139).

121745261 is a wasteful number, since it uses less digits than its factorization.

121745261 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1900.

The product of its digits is 3360, while the sum is 29.

The square root of 121745261 is about 11033.8234986790. The cubic root of 121745261 is about 495.6221283533.

The spelling of 121745261 in words is "one hundred twenty-one million, seven hundred forty-five thousand, two hundred sixty-one".