1021657243 has 2 divisors, whose sum is σ = 1021657244. Its totient is φ = 1021657242.

The previous prime is 1021657207. The next prime is 1021657261. The reversal of 1021657243 is 3427561201.

1021657243 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1021657243 is a prime.

It is a super-2 number, since 2×1021657243² = 2087567044348722098, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1021658243) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 510828621 + 510828622.

It is an arithmetic number, because the mean of its divisors is an integer number (510828622).

Almost surely, 2^1021657243 is an apocalyptic number.

1021657243 is a deficient number, since it is larger than the sum of its proper divisors (1).

1021657243 is an equidigital number, since it uses as much as digits as its factorization.

1021657243 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 10080, while the sum is 31.

The square root of 1021657243 is about 31963.3734608849. The cubic root of 1021657243 is about 1007.1675839965.

The spelling of 1021657243 in words is "one billion, twenty-one million, six hundred fifty-seven thousand, two hundred forty-three".