1451521993 has 2 divisors, whose sum is σ = 1451521994. Its totient is φ = 1451521992.

The previous prime is 1451521979. The next prime is 1451522027. The reversal of 1451521993 is 3991251541.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1173199504 + 278322489 = 34252^2 + 16683^2 .

It is a cyclic number.

It is not a de Polignac number, because 1451521993 - 2²⁵ = 1417967561 is a prime.

It is not a weakly prime, because it can be changed into another prime (1451521963) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 725760996 + 725760997.

It is an arithmetic number, because the mean of its divisors is an integer number (725760997).

Almost surely, 2^1451521993 is an apocalyptic number.

It is an amenable number.

1451521993 is a deficient number, since it is larger than the sum of its proper divisors (1).

1451521993 is an equidigital number, since it uses as much as digits as its factorization.

1451521993 is an evil number, because the sum of its binary digits is even.

The product of its digits is 48600, while the sum is 40.

The square root of 1451521993 is about 38098.8450349876. The cubic root of 1451521993 is about 1132.2470734836.

The spelling of 1451521993 in words is "one billion, four hundred fifty-one million, five hundred twenty-one thousand, nine hundred ninety-three".