1011990031 has 8 divisors (see below), whose sum is σ = 1090103504. Its totient is φ = 933914880.

The previous prime is 1011990029. The next prime is 1011990037. The reversal of 1011990031 is 1300991101.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1011990031 - 2¹ = 1011990029 is a prime.

It is a super-2 number, since 2×1011990031² = 2048247645686761922, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1011989978 and 1011990005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1011990037) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 69496 + ... + 82786.

It is an arithmetic number, because the mean of its divisors is an integer number (136262938).

Almost surely, 2^1011990031 is an apocalyptic number.

1011990031 is a deficient number, since it is larger than the sum of its proper divisors (78113473).

1011990031 is a wasteful number, since it uses less digits than its factorization.

1011990031 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19161.

The product of its (nonzero) digits is 243, while the sum is 25.

The square root of 1011990031 is about 31811.7907543728. The cubic root of 1011990031 is about 1003.9808091309.

The spelling of 1011990031 in words is "one billion, eleven million, nine hundred ninety thousand, thirty-one".