445997991 has 8 divisors (see below), whose sum is σ = 620519040. Its totient is φ = 284404472.

The previous prime is 445997983. The next prime is 445997999. The reversal of 445997991 is 199799544.

It is an interprime number because it is at equal distance from previous prime (445997983) and next prime (445997999).

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

It is a cyclic number.

It is not a de Polignac number, because 445997991 - 2³ = 445997983 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (445997999) 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, 3231801 + ... + 3231938.

It is an arithmetic number, because the mean of its divisors is an integer number (77564880).

Almost surely, 2^445997991 is an apocalyptic number.

445997991 is a deficient number, since it is larger than the sum of its proper divisors (174521049).

445997991 is a wasteful number, since it uses less digits than its factorization.

445997991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6463765.

The product of its digits is 3674160, while the sum is 57.

The square root of 445997991 is about 21118.6645174358. The cubic root of 445997991 is about 764.0309777695.

The spelling of 445997991 in words is "four hundred forty-five million, nine hundred ninety-seven thousand, nine hundred ninety-one".