99979553 has 2 divisors, whose sum is σ = 99979554. Its totient is φ = 99979552.

The previous prime is 99979541. The next prime is 99979591. The reversal of 99979553 is 35597999.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 94926049 + 5053504 = 9743^2 + 2248^2 .

It is an emirp because it is prime and its reverse (35597999) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-99979553 is a prime.

It is a super-2 number, since 2×99979553² = 19991822036159618, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (99979753) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 49989776 + 49989777.

It is an arithmetic number, because the mean of its divisors is an integer number (49989777).

Almost surely, 2^99979553 is an apocalyptic number.

It is an amenable number.

99979553 is a deficient number, since it is larger than the sum of its proper divisors (1).

99979553 is an equidigital number, since it uses as much as digits as its factorization.

99979553 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3444525, while the sum is 56.

The square root of 99979553 is about 9998.9775977347. The cubic root of 99979553 is about 464.1272456826.

The spelling of 99979553 in words is "ninety-nine million, nine hundred seventy-nine thousand, five hundred fifty-three".