121615717 has 8 divisors (see below), whose sum is σ = 125135640. Its totient is φ = 118122240.

The previous prime is 121615661. The next prime is 121615723. The reversal of 121615717 is 717516121.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 2172676 + 119443041 = 1474^2 + 10929^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 121615717 - 2¹¹ = 121613669 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 (121645717) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2913 + ... + 15865.

It is an arithmetic number, because the mean of its divisors is an integer number (15641955).

Almost surely, 2^121615717 is an apocalyptic number.

It is an amenable number.

121615717 is a deficient number, since it is larger than the sum of its proper divisors (3519923).

121615717 is a wasteful number, since it uses less digits than its factorization.

121615717 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13223.

The product of its digits is 2940, while the sum is 31.

The square root of 121615717 is about 11027.9516230350. The cubic root of 121615717 is about 495.4462757616.

The spelling of 121615717 in words is "one hundred twenty-one million, six hundred fifteen thousand, seven hundred seventeen".