898995521 has 2 divisors, whose sum is σ = 898995522. Its totient is φ = 898995520.

The previous prime is 898995463. The next prime is 898995599. The reversal of 898995521 is 125599898.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 812877121 + 86118400 = 28511^2 + 9280^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-898995521 is a prime.

It is a super-2 number, since 2×898995521² = 1616385893556122882, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (898995221) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 449497760 + 449497761.

It is an arithmetic number, because the mean of its divisors is an integer number (449497761).

Almost surely, 2^898995521 is an apocalyptic number.

It is an amenable number.

898995521 is a deficient number, since it is larger than the sum of its proper divisors (1).

898995521 is an equidigital number, since it uses as much as digits as its factorization.

898995521 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2332800, while the sum is 56.

The square root of 898995521 is about 29983.2540095301. The cubic root of 898995521 is about 965.1300605928.

The spelling of 898995521 in words is "eight hundred ninety-eight million, nine hundred ninety-five thousand, five hundred twenty-one".