445551421 has 8 divisors (see below), whose sum is σ = 517832640. Its totient is φ = 375427968.

The previous prime is 445551413. The next prime is 445551427. The reversal of 445551421 is 124155544.

It is a happy number.

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 445551421 - 2³ = 445551413 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 (445551427) 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, 538996 + ... + 539821.

It is an arithmetic number, because the mean of its divisors is an integer number (64729080).

Almost surely, 2^445551421 is an apocalyptic number.

It is an amenable number.

445551421 is a deficient number, since it is larger than the sum of its proper divisors (72281219).

445551421 is a wasteful number, since it uses less digits than its factorization.

445551421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1078883.

The product of its digits is 16000, while the sum is 31.

The square root of 445551421 is about 21108.0889945063. The cubic root of 445551421 is about 763.7758889866.

The spelling of 445551421 in words is "four hundred forty-five million, five hundred fifty-one thousand, four hundred twenty-one".