2215490761 has 15 divisors (see below), whose sum is σ = 2443305655. Its totient is φ = 2008904920.

The previous prime is 2215490749. The next prime is 2215490803. The reversal of 2215490761 is 1670945122.

The square root of 2215490761 is 47069.

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., 522991161 + 1692499600 = 22869^2 + 41140^2 .

It is not a de Polignac number, because 2215490761 - 2⁷ = 2215490633 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 2215490761.

It is not an unprimeable number, because it can be changed into a prime (2215490701) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 14 ways as a sum of consecutive naturals, for example, 5695155 + ... + 5695543.

Almost surely, 2^2215490761 is an apocalyptic number.

2215490761 is the 47069-th square number.

2215490761 is the 23535-th centered octagonal number.

It is an amenable number.

2215490761 is a deficient number, since it is larger than the sum of its proper divisors (227814894).

2215490761 is an frugal number, since it uses more digits than its factorization.

2215490761 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 822 (or 400 counting only the distinct ones).

The product of its (nonzero) digits is 30240, while the sum is 37.

The cubic root of 2215490761 is about 1303.6369087149.

The spelling of 2215490761 in words is "two billion, two hundred fifteen million, four hundred ninety thousand, seven hundred sixty-one".