1021263545631 has 16 divisors (see below), whose sum is σ = 1556317073664. Its totient is φ = 583539435264.

The previous prime is 1021263545567. The next prime is 1021263545669. The reversal of 1021263545631 is 1365453621201.

It is a happy number.

It is not a de Polignac number, because 1021263545631 - 2⁶ = 1021263545567 is a prime.

It is a super-2 number, since 2×1021263545631² (a number of 25 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 1021263545631.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1021263545681) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1338381 + ... + 1958006.

It is an arithmetic number, because the mean of its divisors is an integer number (97269817104).

Almost surely, 2^{1021263545631} is an apocalyptic number.

1021263545631 is a deficient number, since it is larger than the sum of its proper divisors (535053528033).

1021263545631 is a wasteful number, since it uses less digits than its factorization.

1021263545631 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3311150.

The product of its (nonzero) digits is 129600, while the sum is 39.

The spelling of 1021263545631 in words is "one trillion, twenty-one billion, two hundred sixty-three million, five hundred forty-five thousand, six hundred thirty-one".