1091431145 has 16 divisors (see below), whose sum is σ = 1527369600. Its totient is φ = 748408752.

The previous prime is 1091431123. The next prime is 1091431189. The reversal of 1091431145 is 5411341901.

It is not a de Polignac number, because 1091431145 - 2¹² = 1091427049 is a prime.

It is a super-2 number, since 2×1091431145² = 2382443888552022050, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 316487 + ... + 319916.

It is an arithmetic number, because the mean of its divisors is an integer number (95460600).

Almost surely, 2^1091431145 is an apocalyptic number.

It is an amenable number.

1091431145 is a deficient number, since it is larger than the sum of its proper divisors (435938455).

1091431145 is an frugal number, since it uses more digits than its factorization.

1091431145 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 636429 (or 636415 counting only the distinct ones).

The product of its (nonzero) digits is 2160, while the sum is 29.

The square root of 1091431145 is about 33036.8149947903. The cubic root of 1091431145 is about 1029.5926830725.

The spelling of 1091431145 in words is "one billion, ninety-one million, four hundred thirty-one thousand, one hundred forty-five".