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1445421621 = 3771969431
BaseRepresentation
bin101011000100111…
…0110001000110101
310201201211000201010
41112021312020311
510430011442441
6355232222433
750550611130
oct12611661065
93651730633
101445421621
116819a2726
1234409aa19
131a05c2c87
14d9d77217
1586d68116
hex56276235

1445421621 has 16 divisors (see below), whose sum is σ = 2233571328. Its totient is φ = 814321200.

The previous prime is 1445421581. The next prime is 1445421629. The reversal of 1445421621 is 1261245441.

It is not a de Polignac number, because 1445421621 - 27 = 1445421493 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1445421629) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 483225 + ... + 486206.

It is an arithmetic number, because the mean of its divisors is an integer number (139598208).

Almost surely, 21445421621 is an apocalyptic number.

It is an amenable number.

1445421621 is a deficient number, since it is larger than the sum of its proper divisors (788149707).

1445421621 is an equidigital number, since it uses as much as digits as its factorization.

1445421621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 969512.

The product of its digits is 7680, while the sum is 30.

The square root of 1445421621 is about 38018.7009378280. The cubic root of 1445421621 is about 1130.6586655169.

The spelling of 1445421621 in words is "one billion, four hundred forty-five million, four hundred twenty-one thousand, six hundred twenty-one".

Divisors: 1 3 7 21 71 213 497 1491 969431 2908293 6786017 20358051 68829601 206488803 481807207 1445421621