99161765 has 8 divisors (see below), whose sum is σ = 125993880. Its totient is φ = 74662912.

The previous prime is 99161747. The next prime is 99161767. The reversal of 99161765 is 56716199.

It is a happy number.

It is a Cunningham number, because it is equal to 9958²+1.

It can be written as a sum of positive squares in 4 ways, for example, as 2316484 + 96845281 = 1522^2 + 9841^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 99161765 - 2¹⁴ = 99145381 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (99161767) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 583220 + ... + 583389.

It is an arithmetic number, because the mean of its divisors is an integer number (15749235).

Almost surely, 2^99161765 is an apocalyptic number.

It is an amenable number.

99161765 is a deficient number, since it is larger than the sum of its proper divisors (26832115).

99161765 is a wasteful number, since it uses less digits than its factorization.

99161765 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1166631.

The product of its digits is 102060, while the sum is 44.

The square root of 99161765 is about 9958.0000502109. Note that the first 4 decimals coincide. The cubic root of 99161765 is about 462.8583285900.

The spelling of 99161765 in words is "ninety-nine million, one hundred sixty-one thousand, seven hundred sixty-five".