3121661550 has 192 divisors, whose sum is σ = 9430110720. Its totient is φ = 667115520.

The previous prime is 3121661527. The next prime is 3121661581. The reversal of 3121661550 is 551661213.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 3194662 + ... + 3195638.

It is an arithmetic number, because the mean of its divisors is an integer number (49115160).

Almost surely, 2^3121661550 is an apocalyptic number.

3121661550 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 3121661550, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (4715055360).

3121661550 is an abundant number, since it is smaller than the sum of its proper divisors (6308449170).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

3121661550 is a wasteful number, since it uses less digits than its factorization.

3121661550 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1195 (or 1190 counting only the distinct ones).

The product of its (nonzero) digits is 5400, while the sum is 30.

The square root of 3121661550 is about 55871.8314537836. The cubic root of 3121661550 is about 1461.4880602940.

The spelling of 3121661550 in words is "three billion, one hundred twenty-one million, six hundred sixty-one thousand, five hundred fifty".