989950457 has 2 divisors, whose sum is σ = 989950458. Its totient is φ = 989950456.

The previous prime is 989950433. The next prime is 989950499. The reversal of 989950457 is 754059989.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 956726761 + 33223696 = 30931^2 + 5764^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-989950457 is a prime.

It is a super-3 number, since 3×989950457³ (a number of 28 digits) contains 333 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (989950417) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 494975228 + 494975229.

It is an arithmetic number, because the mean of its divisors is an integer number (494975229).

Almost surely, 2^989950457 is an apocalyptic number.

It is an amenable number.

989950457 is a deficient number, since it is larger than the sum of its proper divisors (1).

989950457 is an equidigital number, since it uses as much as digits as its factorization.

989950457 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4082400, while the sum is 56.

The square root of 989950457 is about 31463.4781453036. The cubic root of 989950457 is about 996.6388677807.

The spelling of 989950457 in words is "nine hundred eighty-nine million, nine hundred fifty thousand, four hundred fifty-seven".