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15421493 is a prime number
BaseRepresentation
bin111010110101…
…000000110101
31002000111022102
4322311000311
512421441433
61310311445
7245036423
oct72650065
932014272
1015421493
11878343a
1251b8585
13326c459
142096113
1515494e8
hexeb5035

15421493 has 2 divisors, whose sum is σ = 15421494. Its totient is φ = 15421492.

The previous prime is 15421487. The next prime is 15421507. The reversal of 15421493 is 39412451.

15421493 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 14455204 + 966289 = 3802^2 + 983^2 .

It is a cyclic number.

It is not a de Polignac number, because 15421493 - 212 = 15417397 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (15421423) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7710746 + 7710747.

It is an arithmetic number, because the mean of its divisors is an integer number (7710747).

Almost surely, 215421493 is an apocalyptic number.

It is an amenable number.

15421493 is a deficient number, since it is larger than the sum of its proper divisors (1).

15421493 is an equidigital number, since it uses as much as digits as its factorization.

15421493 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4320, while the sum is 29.

The square root of 15421493 is about 3927.0208810242. The cubic root of 15421493 is about 248.9098828205.

The spelling of 15421493 in words is "fifteen million, four hundred twenty-one thousand, four hundred ninety-three".