99997951 has 4 divisors (see below), whose sum is σ = 104345712. Its totient is φ = 95650192.

The previous prime is 99997949. The next prime is 99997957. The reversal of 99997951 is 15979999.

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

It is not a de Polignac number, because 99997951 - 2¹ = 99997949 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (99997957) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2173846 + ... + 2173891.

It is an arithmetic number, because the mean of its divisors is an integer number (26086428).

Almost surely, 2^99997951 is an apocalyptic number.

99997951 is a deficient number, since it is larger than the sum of its proper divisors (4347761).

99997951 is a wasteful number, since it uses less digits than its factorization.

99997951 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4347760.

The product of its digits is 2066715, while the sum is 58.

The square root of 99997951 is about 9999.8975494752. The cubic root of 99997951 is about 464.1557131345.

The spelling of 99997951 in words is "ninety-nine million, nine hundred ninety-seven thousand, nine hundred fifty-one".