121618751 has 8 divisors (see below), whose sum is σ = 127237824. Its totient is φ = 116126080.

The previous prime is 121618747. The next prime is 121618771. The reversal of 121618751 is 157816121.

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 121618751 - 2² = 121618747 is a prime.

It is a super-2 number, since 2×121618751² = 29582241189600002, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121618711) 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, 29630 + ... + 33483.

It is an arithmetic number, because the mean of its divisors is an integer number (15904728).

Almost surely, 2^121618751 is an apocalyptic number.

121618751 is a deficient number, since it is larger than the sum of its proper divisors (5619073).

121618751 is an equidigital number, since it uses as much as digits as its factorization.

121618751 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 63201.

The product of its digits is 3360, while the sum is 32.

The square root of 121618751 is about 11028.0891817214. The cubic root of 121618751 is about 495.4503957650.

The spelling of 121618751 in words is "one hundred twenty-one million, six hundred eighteen thousand, seven hundred fifty-one".