1231055165 has 16 divisors (see below), whose sum is σ = 1499821056. Its totient is φ = 969912000.

The previous prime is 1231055149. The next prime is 1231055171. The reversal of 1231055165 is 5615501321.

It is not a de Polignac number, because 1231055165 - 2⁴ = 1231055149 is a prime.

It is a Duffinian number.

It is a congruent number.

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, 90074 + ... + 102836.

It is an arithmetic number, because the mean of its divisors is an integer number (93738816).

Almost surely, 2^1231055165 is an apocalyptic number.

It is an amenable number.

1231055165 is a deficient number, since it is larger than the sum of its proper divisors (268765891).

1231055165 is a wasteful number, since it uses less digits than its factorization.

1231055165 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13060.

The product of its (nonzero) digits is 4500, while the sum is 29.

The square root of 1231055165 is about 35086.3957254090. The cubic root of 1231055165 is about 1071.7475635115.

Adding to 1231055165 its reverse (5615501321), we get a palindrome (6846556486).

The spelling of 1231055165 in words is "one billion, two hundred thirty-one million, fifty-five thousand, one hundred sixty-five".