1011115531 has 2 divisors, whose sum is σ = 1011115532. Its totient is φ = 1011115530.

The previous prime is 1011115519. The next prime is 1011115541. The reversal of 1011115531 is 1355111101.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1011115531 - 2¹¹ = 1011113483 is a prime.

It is a super-2 number, since 2×1011115531² = 2044709234058823922, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1011115499 and 1011115508.

It is not a weakly prime, because it can be changed into another prime (1011115541) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 505557765 + 505557766.

It is an arithmetic number, because the mean of its divisors is an integer number (505557766).

Almost surely, 2^1011115531 is an apocalyptic number.

1011115531 is a deficient number, since it is larger than the sum of its proper divisors (1).

1011115531 is an equidigital number, since it uses as much as digits as its factorization.

1011115531 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 75, while the sum is 19.

The square root of 1011115531 is about 31798.0428800264. The cubic root of 1011115531 is about 1003.6915328168.

Adding to 1011115531 its reverse (1355111101), we get a palindrome (2366226632).

The spelling of 1011115531 in words is "one billion, eleven million, one hundred fifteen thousand, five hundred thirty-one".