99542217251 has 4 divisors (see below), whose sum is σ = 99543502104. Its totient is φ = 99540932400.

The previous prime is 99542217239. The next prime is 99542217263. The reversal of 99542217251 is 15271224599.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (99542217239) and next prime (99542217263).

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-99542217251 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 99542217196 and 99542217205.

It is not an unprimeable number, because it can be changed into a prime (99542216251) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 518210 + ... + 683831.

It is an arithmetic number, because the mean of its divisors is an integer number (24885875526).

Almost surely, 2^99542217251 is an apocalyptic number.

99542217251 is a deficient number, since it is larger than the sum of its proper divisors (1284853).

99542217251 is a wasteful number, since it uses less digits than its factorization.

99542217251 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1284852.

The product of its digits is 453600, while the sum is 47.

The spelling of 99542217251 in words is "ninety-nine billion, five hundred forty-two million, two hundred seventeen thousand, two hundred fifty-one".