121518131 has 8 divisors (see below), whose sum is σ = 144916224. Its totient is φ = 99629640.

The previous prime is 121518119. The next prime is 121518143. The reversal of 121518131 is 131815121.

It is an interprime number because it is at equal distance from previous prime (121518119) and next prime (121518143).

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 121518131 - 2¹⁰ = 121517107 is a prime.

It is a super-2 number, since 2×121518131² = 29533312323466322, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (23).

It is a Duffinian number.

It is a zygodrome in base 2.

It is a junction number, because it is equal to n+sod(n) for n = 121518097 and 121518106.

It is not an unprimeable number, because it can be changed into a prime (121518031) 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, 377225 + ... + 377546.

It is an arithmetic number, because the mean of its divisors is an integer number (18114528).

Almost surely, 2^121518131 is an apocalyptic number.

121518131 is a deficient number, since it is larger than the sum of its proper divisors (23398093).

121518131 is an equidigital number, since it uses as much as digits as its factorization.

121518131 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 754801.

The product of its digits is 240, while the sum is 23.

The square root of 121518131 is about 11023.5262507058. The cubic root of 121518131 is about 495.3137228343.

The spelling of 121518131 in words is "one hundred twenty-one million, five hundred eighteen thousand, one hundred thirty-one".