10998557 has 2 divisors, whose sum is σ = 10998558. Its totient is φ = 10998556.

The previous prime is 10998553. The next prime is 10998563. The reversal of 10998557 is 75589901.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 6584356 + 4414201 = 2566^2 + 2101^2 .

It is a cyclic number.

It is not a de Polignac number, because 10998557 - 2² = 10998553 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (10998551) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5499278 + 5499279.

It is an arithmetic number, because the mean of its divisors is an integer number (5499279).

Almost surely, 2^10998557 is an apocalyptic number.

It is an amenable number.

10998557 is a deficient number, since it is larger than the sum of its proper divisors (1).

10998557 is an equidigital number, since it uses as much as digits as its factorization.

10998557 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 113400, while the sum is 44.

The square root of 10998557 is about 3316.4072427855. The cubic root of 10998557 is about 222.3882837733.

The spelling of 10998557 in words is "ten million, nine hundred ninety-eight thousand, five hundred fifty-seven".