989953477 has 2 divisors, whose sum is σ = 989953478. Its totient is φ = 989953476.

The previous prime is 989953457. The next prime is 989953493. The reversal of 989953477 is 774359989.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 526886116 + 463067361 = 22954^2 + 21519^2 .

It is a cyclic number.

It is not a de Polignac number, because 989953477 - 2¹⁵ = 989920709 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (989953417) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 494976738 + 494976739.

It is an arithmetic number, because the mean of its divisors is an integer number (494976739).

Almost surely, 2^989953477 is an apocalyptic number.

It is an amenable number.

989953477 is a deficient number, since it is larger than the sum of its proper divisors (1).

989953477 is an equidigital number, since it uses as much as digits as its factorization.

989953477 is an evil number, because the sum of its binary digits is even.

The product of its digits is 17146080, while the sum is 61.

The square root of 989953477 is about 31463.5261374182. The cubic root of 989953477 is about 996.6398812477.

The spelling of 989953477 in words is "nine hundred eighty-nine million, nine hundred fifty-three thousand, four hundred seventy-seven".