1099431 has 12 divisors (see below), whose sum is σ = 1600560. Its totient is φ = 727200.

The previous prime is 1099421. The next prime is 1099433. The reversal of 1099431 is 1349901.

It is not a de Polignac number, because 1099431 - 2¹³ = 1091239 is a prime.

It is a super-2 number, since 2×1099431² = 2417497047522, which contains 22 as substring.

It is a hoax number, since the sum of its digits (27) coincides with the sum of the digits of its distinct prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 1099395 and 1099404.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1099433) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 955 + ... + 1763.

It is an arithmetic number, because the mean of its divisors is an integer number (133380).

2^1099431 is an apocalyptic number.

1099431 is a deficient number, since it is larger than the sum of its proper divisors (501129).

1099431 is a wasteful number, since it uses less digits than its factorization.

1099431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 966 (or 963 counting only the distinct ones).

The product of its (nonzero) digits is 972, while the sum is 27.

The square root of 1099431 is about 1048.5375529756. The cubic root of 1099431 is about 103.2102094641.

It can be divided in two parts, 10994 and 31, that added together give a square (11025 = 105²).

The spelling of 1099431 in words is "one million, ninety-nine thousand, four hundred thirty-one".