2651220100 has 81 divisors (see below), whose sum is σ = 6094369701. Its totient is φ = 1000965600.

The previous prime is 2651220079. The next prime is 2651220101. The reversal of 2651220100 is 10221562.

The square root of 2651220100 is 51490.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 954439236 + 1696780864 = 30894^2 + 41192^2 .

It is a Harshad number since it is a multiple of its sum of digits (19).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2651220101) by changing a digit.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 9782965 + ... + 9783235.

Almost surely, 2^2651220100 is an apocalyptic number.

2651220100 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

2651220100 is the 51490-th square number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 2651220100

2651220100 is an abundant number, since it is smaller than the sum of its proper divisors (3443149601).

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

2651220100 is a wasteful number, since it uses less digits than its factorization.

2651220100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 594 (or 297 counting only the distinct ones).

The product of its (nonzero) digits is 240, while the sum is 19.

The cubic root of 2651220100 is about 1384.0398494156.

Adding to 2651220100 its reverse (10221562), we get a palindrome (2661441662).

The spelling of 2651220100 in words is "two billion, six hundred fifty-one million, two hundred twenty thousand, one hundred".