1145457421 has 2 divisors, whose sum is σ = 1145457422. Its totient is φ = 1145457420.

The previous prime is 1145457407. The next prime is 1145457449. The reversal of 1145457421 is 1247545411.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 657666025 + 487791396 = 25645^2 + 22086^2 .

It is a cyclic number.

It is not a de Polignac number, because 1145457421 - 2¹³ = 1145449229 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1145457721) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 572728710 + 572728711.

It is an arithmetic number, because the mean of its divisors is an integer number (572728711).

Almost surely, 2^1145457421 is an apocalyptic number.

It is an amenable number.

1145457421 is a deficient number, since it is larger than the sum of its proper divisors (1).

1145457421 is an equidigital number, since it uses as much as digits as its factorization.

1145457421 is an evil number, because the sum of its binary digits is even.

The product of its digits is 22400, while the sum is 34.

The square root of 1145457421 is about 33844.6069706829. The cubic root of 1145457421 is about 1046.3082509235.

The spelling of 1145457421 in words is "one billion, one hundred forty-five million, four hundred fifty-seven thousand, four hundred twenty-one".