3121518149 has 4 divisors (see below), whose sum is σ = 3197652780. Its totient is φ = 3045383520.

The previous prime is 3121518143. The next prime is 3121518161. The reversal of 3121518149 is 9418151213.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 120450625 + 3001067524 = 10975^2 + 54782^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-3121518149 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a zygodrome in base 3.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3121518143) 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, 38067254 + ... + 38067335.

It is an arithmetic number, because the mean of its divisors is an integer number (799413195).

Almost surely, 2^3121518149 is an apocalyptic number.

It is an amenable number.

3121518149 is a deficient number, since it is larger than the sum of its proper divisors (76134631).

3121518149 is an equidigital number, since it uses as much as digits as its factorization.

3121518149 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 76134630.

The product of its digits is 8640, while the sum is 35.

The square root of 3121518149 is about 55870.5481358470. The cubic root of 3121518149 is about 1461.4656809665.

The spelling of 3121518149 in words is "three billion, one hundred twenty-one million, five hundred eighteen thousand, one hundred forty-nine".