121650017 has 4 divisors (see below), whose sum is σ = 121672980. Its totient is φ = 121627056.

The previous prime is 121649987. The next prime is 121650019. The reversal of 121650017 is 710056121.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 710056121 = 379 ⋅1873499.

It can be written as a sum of positive squares in 2 ways, for example, as 51609856 + 70040161 = 7184^2 + 8369^2 .

It is a cyclic number.

It is not a de Polignac number, because 121650017 - 2⁶ = 121649953 is a prime.

It is a super-2 number, since 2×121650017² = 29597453272200578, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 121649974 and 121650001.

It is not an unprimeable number, because it can be changed into a prime (121650019) 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, 959 + ... + 15627.

It is an arithmetic number, because the mean of its divisors is an integer number (30418245).

Almost surely, 2^121650017 is an apocalyptic number.

It is an amenable number.

121650017 is a deficient number, since it is larger than the sum of its proper divisors (22963).

121650017 is an equidigital number, since it uses as much as digits as its factorization.

121650017 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22962.

The product of its (nonzero) digits is 420, while the sum is 23.

The square root of 121650017 is about 11029.5066526114. The cubic root of 121650017 is about 495.4928492646.

The spelling of 121650017 in words is "one hundred twenty-one million, six hundred fifty thousand, seventeen".