1020645947 has 2 divisors, whose sum is σ = 1020645948. Its totient is φ = 1020645946.

The previous prime is 1020645943. The next prime is 1020645973. The reversal of 1020645947 is 7495460201.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1020645947 - 2² = 1020645943 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1020645947.

It is not a weakly prime, because it can be changed into another prime (1020645943) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 510322973 + 510322974.

It is an arithmetic number, because the mean of its divisors is an integer number (510322974).

Almost surely, 2^1020645947 is an apocalyptic number.

1020645947 is a deficient number, since it is larger than the sum of its proper divisors (1).

1020645947 is an equidigital number, since it uses as much as digits as its factorization.

1020645947 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 60480, while the sum is 38.

The square root of 1020645947 is about 31947.5499373583. The cubic root of 1020645947 is about 1006.8351565239.

The spelling of 1020645947 in words is "one billion, twenty million, six hundred forty-five thousand, nine hundred forty-seven".