99951557 has 2 divisors, whose sum is σ = 99951558. Its totient is φ = 99951556.

The previous prime is 99951529. The next prime is 99951569. The reversal of 99951557 is 75515999.

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., 99720196 + 231361 = 9986^2 + 481^2 .

It is a cyclic number.

It is not a de Polignac number, because 99951557 - 2⁸ = 99951301 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (99951757) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 49975778 + 49975779.

It is an arithmetic number, because the mean of its divisors is an integer number (49975779).

Almost surely, 2^99951557 is an apocalyptic number.

It is an amenable number.

99951557 is a deficient number, since it is larger than the sum of its proper divisors (1).

99951557 is an equidigital number, since it uses as much as digits as its factorization.

99951557 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 637875, while the sum is 50.

The square root of 99951557 is about 9997.5775565884. The cubic root of 99951557 is about 464.0839204259.

The spelling of 99951557 in words is "ninety-nine million, nine hundred fifty-one thousand, five hundred fifty-seven".