1026438376261 has 2 divisors, whose sum is σ = 1026438376262. Its totient is φ = 1026438376260.

The previous prime is 1026438376231. The next prime is 1026438376319. The reversal of 1026438376261 is 1626738346201.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 516026722500 + 510411653761 = 718350^2 + 714431^2 .

It is a cyclic number.

It is not a de Polignac number, because 1026438376261 - 2⁷ = 1026438376133 is a prime.

It is a super-2 number, since 2×1026438376261² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1026438376211) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 513219188130 + 513219188131.

It is an arithmetic number, because the mean of its divisors is an integer number (513219188131).

Almost surely, 2^{1026438376261} is an apocalyptic number.

It is an amenable number.

1026438376261 is a deficient number, since it is larger than the sum of its proper divisors (1).

1026438376261 is an equidigital number, since it uses as much as digits as its factorization.

1026438376261 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1741824, while the sum is 49.

The spelling of 1026438376261 in words is "one trillion, twenty-six billion, four hundred thirty-eight million, three hundred seventy-six thousand, two hundred sixty-one".