1011031263261 has 16 divisors (see below), whose sum is σ = 1549473201600. Its totient is φ = 650778743664.

The previous prime is 1011031263257. The next prime is 1011031263271. The reversal of 1011031263261 is 1623621301101.

It is a happy number.

1011031263261 is a `hidden beast` number, since 1 + 0 + 1 + 10 + 3 + 12 + 632 + 6 + 1 = 666.

It is not a de Polignac number, because 1011031263261 - 2² = 1011031263257 is a prime.

It is a super-2 number, since 2×1011031263261² (a number of 25 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1011031263241) 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, 645613051 + ... + 645614616.

It is an arithmetic number, because the mean of its divisors is an integer number (96842075100).

Almost surely, 2^{1011031263261} is an apocalyptic number.

It is an amenable number.

1011031263261 is a deficient number, since it is larger than the sum of its proper divisors (538441938339).

1011031263261 is a wasteful number, since it uses less digits than its factorization.

1011031263261 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1291227705 (or 1291227699 counting only the distinct ones).

The product of its (nonzero) digits is 1296, while the sum is 27.

Adding to 1011031263261 its reverse (1623621301101), we get a palindrome (2634652564362).

The spelling of 1011031263261 in words is "one trillion, eleven billion, thirty-one million, two hundred sixty-three thousand, two hundred sixty-one".