1023205642531 has 2 divisors, whose sum is σ = 1023205642532. Its totient is φ = 1023205642530.

The previous prime is 1023205642477. The next prime is 1023205642633. The reversal of 1023205642531 is 1352465023201.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1023205642531 is a prime.

It is a super-2 number, since 2×1023205642531² (a number of 25 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1023205642331) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 511602821265 + 511602821266.

It is an arithmetic number, because the mean of its divisors is an integer number (511602821266).

Almost surely, 2^{1023205642531} is an apocalyptic number.

1023205642531 is a deficient number, since it is larger than the sum of its proper divisors (1).

1023205642531 is an equidigital number, since it uses as much as digits as its factorization.

1023205642531 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 43200, while the sum is 34.

The spelling of 1023205642531 in words is "one trillion, twenty-three billion, two hundred five million, six hundred forty-two thousand, five hundred thirty-one".