121705513 has 4 divisors (see below), whose sum is σ = 124295040. Its totient is φ = 119115988.

The previous prime is 121705477. The next prime is 121705537. The reversal of 121705513 is 315507121.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 315507121 = 857 ⋅368153.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-121705513 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (121805513) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1294693 + ... + 1294786.

It is an arithmetic number, because the mean of its divisors is an integer number (31073760).

Almost surely, 2^121705513 is an apocalyptic number.

It is an amenable number.

121705513 is a deficient number, since it is larger than the sum of its proper divisors (2589527).

121705513 is an equidigital number, since it uses as much as digits as its factorization.

121705513 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2589526.

The product of its (nonzero) digits is 1050, while the sum is 25.

The square root of 121705513 is about 11032.0221627769. The cubic root of 121705513 is about 495.5681847542.

The spelling of 121705513 in words is "one hundred twenty-one million, seven hundred five thousand, five hundred thirteen".