1021061156497 has 2 divisors, whose sum is σ = 1021061156498. Its totient is φ = 1021061156496.

The previous prime is 1021061156447. The next prime is 1021061156519. The reversal of 1021061156497 is 7946511601201.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 591805565521 + 429255590976 = 769289^2 + 655176^2 .

It is a cyclic number.

It is not a de Polignac number, because 1021061156497 - 2²⁷ = 1020926938769 is a prime.

It is a super-2 number, since 2×1021061156497² (a number of 25 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1021061156447) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 510530578248 + 510530578249.

It is an arithmetic number, because the mean of its divisors is an integer number (510530578249).

Almost surely, 2^{1021061156497} is an apocalyptic number.

It is an amenable number.

1021061156497 is a deficient number, since it is larger than the sum of its proper divisors (1).

1021061156497 is an equidigital number, since it uses as much as digits as its factorization.

1021061156497 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 90720, while the sum is 43.

Adding to 1021061156497 its reverse (7946511601201), we get a palindrome (8967572757698).

The spelling of 1021061156497 in words is "one trillion, twenty-one billion, sixty-one million, one hundred fifty-six thousand, four hundred ninety-seven".