10551581 has 2 divisors, whose sum is σ = 10551582. Its totient is φ = 10551580.

The previous prime is 10551559. The next prime is 10551587. The reversal of 10551581 is 18515501.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 10048900 + 502681 = 3170^2 + 709^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-10551581 is a prime.

It is a super-2 number, since 2×10551581² = 222671723199122, which contains 22 as substring.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 10551581.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (10551587) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5275790 + 5275791.

It is an arithmetic number, because the mean of its divisors is an integer number (5275791).

Almost surely, 2^10551581 is an apocalyptic number.

It is an amenable number.

10551581 is a deficient number, since it is larger than the sum of its proper divisors (1).

10551581 is an equidigital number, since it uses as much as digits as its factorization.

10551581 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1000, while the sum is 26.

The square root of 10551581 is about 3248.3197194858. The cubic root of 10551581 is about 219.3339428255. Note that the first 3 decimals are identical.

The spelling of 10551581 in words is "ten million, five hundred fifty-one thousand, five hundred eighty-one".