1651242449 has 2 divisors, whose sum is σ = 1651242450. Its totient is φ = 1651242448.

The previous prime is 1651242433. The next prime is 1651242503. The reversal of 1651242449 is 9442421561.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1643734849 + 7507600 = 40543^2 + 2740^2 .

It is an emirp because it is prime and its reverse (9442421561) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1651242449 - 2⁴ = 1651242433 is a prime.

It is not a weakly prime, because it can be changed into another prime (1651242149) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 825621224 + 825621225.

It is an arithmetic number, because the mean of its divisors is an integer number (825621225).

Almost surely, 2^1651242449 is an apocalyptic number.

It is an amenable number.

1651242449 is a deficient number, since it is larger than the sum of its proper divisors (1).

1651242449 is an equidigital number, since it uses as much as digits as its factorization.

1651242449 is an evil number, because the sum of its binary digits is even.

The product of its digits is 69120, while the sum is 38.

The square root of 1651242449 is about 40635.4826352536. The cubic root of 1651242449 is about 1181.9622739173.

The spelling of 1651242449 in words is "one billion, six hundred fifty-one million, two hundred forty-two thousand, four hundred forty-nine".