1085639951 has 12 divisors (see below), whose sum is σ = 1245192816. Its totient is φ = 944032320.

The previous prime is 1085639939. The next prime is 1085639953. The reversal of 1085639951 is 1599365801.

It is not a de Polignac number, because 1085639951 - 2¹⁸ = 1085377807 is a prime.

It is a super-2 number, since 2×1085639951² = 2357228206414564802, 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 = 1085639896 and 1085639905.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1085639953) 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, 192266 + ... + 197831.

It is an arithmetic number, because the mean of its divisors is an integer number (103766068).

Almost surely, 2^1085639951 is an apocalyptic number.

1085639951 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

1085639951 is a deficient number, since it is larger than the sum of its proper divisors (159552865).

1085639951 is a wasteful number, since it uses less digits than its factorization.

1085639951 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 390142 (or 390131 counting only the distinct ones).

The product of its (nonzero) digits is 291600, while the sum is 47.

The square root of 1085639951 is about 32949.0508361015. The cubic root of 1085639951 is about 1027.7684274902.

The spelling of 1085639951 in words is "one billion, eighty-five million, six hundred thirty-nine thousand, nine hundred fifty-one".