11561290 has 24 divisors (see below), whose sum is σ = 22537548. Its totient is φ = 4268160.

The previous prime is 11561287. The next prime is 11561317. The reversal of 11561290 is 9216511.

It can be written as a sum of positive squares in 6 ways, for example, as 2277081 + 9284209 = 1509^2 + 3047^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1731 + ... + 5110.

Almost surely, 2^11561290 is an apocalyptic number.

11561290 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

11561290 is a deficient number, since it is larger than the sum of its proper divisors (10976258).

11561290 is a wasteful number, since it uses less digits than its factorization.

11561290 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6874 (or 6861 counting only the distinct ones).

The product of its (nonzero) digits is 540, while the sum is 25.

The square root of 11561290 is about 3400.1897005902. The cubic root of 11561290 is about 226.1181542093.

The spelling of 11561290 in words is "eleven million, five hundred sixty-one thousand, two hundred ninety".