1245352921 has 2 divisors, whose sum is σ = 1245352922. Its totient is φ = 1245352920.

The previous prime is 1245352907. The next prime is 1245352939. The reversal of 1245352921 is 1292535421.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1141088400 + 104264521 = 33780^2 + 10211^2 .

It is a cyclic number.

It is not a de Polignac number, because 1245352921 - 2⁷ = 1245352793 is a prime.

It is not a weakly prime, because it can be changed into another prime (1245352951) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 622676460 + 622676461.

It is an arithmetic number, because the mean of its divisors is an integer number (622676461).

Almost surely, 2^1245352921 is an apocalyptic number.

It is an amenable number.

1245352921 is a deficient number, since it is larger than the sum of its proper divisors (1).

1245352921 is an equidigital number, since it uses as much as digits as its factorization.

1245352921 is an evil number, because the sum of its binary digits is even.

The product of its digits is 21600, while the sum is 34.

The square root of 1245352921 is about 35289.5582431971. The cubic root of 1245352921 is about 1075.8807769144.

The spelling of 1245352921 in words is "one billion, two hundred forty-five million, three hundred fifty-two thousand, nine hundred twenty-one".