99771953 has 4 divisors (see below), whose sum is σ = 104109888. Its totient is φ = 95434020.

The previous prime is 99771949. The next prime is 99771967. The reversal of 99771953 is 35917799.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 99771953 - 2² = 99771949 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (99771253) 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, 2168933 + ... + 2168978.

It is an arithmetic number, because the mean of its divisors is an integer number (26027472).

Almost surely, 2^99771953 is an apocalyptic number.

It is an amenable number.

99771953 is a deficient number, since it is larger than the sum of its proper divisors (4337935).

99771953 is a wasteful number, since it uses less digits than its factorization.

99771953 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4337934.

The product of its digits is 535815, while the sum is 50.

The square root of 99771953 is about 9988.5911418978. The cubic root of 99771953 is about 463.8057813427.

The spelling of 99771953 in words is "ninety-nine million, seven hundred seventy-one thousand, nine hundred fifty-three".