2115651000 has 128 divisors (see below), whose sum is σ = 6646536000. Its totient is φ = 560268800.

The previous prime is 2115650981. The next prime is 2115651053. The reversal of 2115651000 is 1565112.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 444634 + ... + 449366.

Almost surely, 2^2115651000 is an apocalyptic number.

2115651000 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 2115651000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3323268000).

2115651000 is an abundant number, since it is smaller than the sum of its proper divisors (4530885000).

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

2115651000 is a wasteful number, since it uses less digits than its factorization.

2115651000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4906 (or 4892 counting only the distinct ones).

The product of its (nonzero) digits is 300, while the sum is 21.

The square root of 2115651000 is about 45996.2063653080. The cubic root of 2115651000 is about 1283.7526187558.

The spelling of 2115651000 in words is "two billion, one hundred fifteen million, six hundred fifty-one thousand".