1021545457 has 2 divisors, whose sum is σ = 1021545458. Its totient is φ = 1021545456.

The previous prime is 1021545443. The next prime is 1021545527. The reversal of 1021545457 is 7545451201.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1013530896 + 8014561 = 31836^2 + 2831^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1021545457 is a prime.

It is not a weakly prime, because it can be changed into another prime (1021545407) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 510772728 + 510772729.

It is an arithmetic number, because the mean of its divisors is an integer number (510772729).

Almost surely, 2^1021545457 is an apocalyptic number.

It is an amenable number.

1021545457 is a deficient number, since it is larger than the sum of its proper divisors (1).

1021545457 is an equidigital number, since it uses as much as digits as its factorization.

1021545457 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 28000, while the sum is 34.

The square root of 1021545457 is about 31961.6247553218. The cubic root of 1021545457 is about 1007.1308491252.

Adding to 1021545457 its reverse (7545451201), we get a palindrome (8566996658).

The spelling of 1021545457 in words is "one billion, twenty-one million, five hundred forty-five thousand, four hundred fifty-seven".