99951601 has 2 divisors, whose sum is σ = 99951602. Its totient is φ = 99951600.

The previous prime is 99951569. The next prime is 99951623. The reversal of 99951601 is 10615999.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 98903025 + 1048576 = 9945^2 + 1024^2 .

It is an emirp because it is prime and its reverse (10615999) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 99951601 - 2⁵ = 99951569 is a prime.

It is not a weakly prime, because it can be changed into another prime (99951301) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 49975800 + 49975801.

It is an arithmetic number, because the mean of its divisors is an integer number (49975801).

Almost surely, 2^99951601 is an apocalyptic number.

It is an amenable number.

99951601 is a deficient number, since it is larger than the sum of its proper divisors (1).

99951601 is an equidigital number, since it uses as much as digits as its factorization.

99951601 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 21870, while the sum is 40.

The square root of 99951601 is about 9997.5797571212. The cubic root of 99951601 is about 464.0839885245.

The spelling of 99951601 in words is "ninety-nine million, nine hundred fifty-one thousand, six hundred one".