990128039357 has 2 divisors, whose sum is σ = 990128039358. Its totient is φ = 990128039356.

The previous prime is 990128039321. The next prime is 990128039371. The reversal of 990128039357 is 753930821099.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 570922292836 + 419205746521 = 755594^2 + 647461^2 .

It is a cyclic number.

It is not a de Polignac number, because 990128039357 - 2³⁰ = 989054297533 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (990128039657) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 495064019678 + 495064019679.

It is an arithmetic number, because the mean of its divisors is an integer number (495064019679).

Almost surely, 2^990128039357 is an apocalyptic number.

It is an amenable number.

990128039357 is a deficient number, since it is larger than the sum of its proper divisors (1).

990128039357 is an equidigital number, since it uses as much as digits as its factorization.

990128039357 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3674160, while the sum is 56.

The spelling of 990128039357 in words is "nine hundred ninety billion, one hundred twenty-eight million, thirty-nine thousand, three hundred fifty-seven".