1493453821 has 2 divisors, whose sum is σ = 1493453822. Its totient is φ = 1493453820.

The previous prime is 1493453719. The next prime is 1493453867. The reversal of 1493453821 is 1283543941.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1368260100 + 125193721 = 36990^2 + 11189^2 .

It is a cyclic number.

It is not a de Polignac number, because 1493453821 - 2⁷ = 1493453693 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1493453021) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 746726910 + 746726911.

It is an arithmetic number, because the mean of its divisors is an integer number (746726911).

Almost surely, 2^1493453821 is an apocalyptic number.

It is an amenable number.

1493453821 is a deficient number, since it is larger than the sum of its proper divisors (1).

1493453821 is an equidigital number, since it uses as much as digits as its factorization.

1493453821 is an evil number, because the sum of its binary digits is even.

The product of its digits is 103680, while the sum is 40.

The square root of 1493453821 is about 38645.2302490230. The cubic root of 1493453821 is about 1143.0465910664.

The spelling of 1493453821 in words is "one billion, four hundred ninety-three million, four hundred fifty-three thousand, eight hundred twenty-one".