1945021807 has 2 divisors, whose sum is σ = 1945021808. Its totient is φ = 1945021806.

The previous prime is 1945021781. The next prime is 1945021817. The reversal of 1945021807 is 7081205491.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1945021807 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1945021817) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 972510903 + 972510904.

It is an arithmetic number, because the mean of its divisors is an integer number (972510904).

Almost surely, 2^1945021807 is an apocalyptic number.

1945021807 is a deficient number, since it is larger than the sum of its proper divisors (1).

1945021807 is an equidigital number, since it uses as much as digits as its factorization.

1945021807 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 20160, while the sum is 37.

The square root of 1945021807 is about 44102.4013745283. The cubic root of 1945021807 is about 1248.2689226302.

The spelling of 1945021807 in words is "one billion, nine hundred forty-five million, twenty-one thousand, eight hundred seven".