1265131155 has 32 divisors (see below), whose sum is σ = 2066796288. Its totient is φ = 660643200.

The previous prime is 1265131141. The next prime is 1265131199. The reversal of 1265131155 is 5511315621.

It is not a de Polignac number, because 1265131155 - 2⁷ = 1265131027 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 204660 + ... + 210750.

It is an arithmetic number, because the mean of its divisors is an integer number (64587384).

Almost surely, 2^1265131155 is an apocalyptic number.

1265131155 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

1265131155 is a deficient number, since it is larger than the sum of its proper divisors (801665133).

1265131155 is a wasteful number, since it uses less digits than its factorization.

1265131155 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6387.

The product of its digits is 4500, while the sum is 30.

The square root of 1265131155 is about 35568.6822218648. The cubic root of 1265131155 is about 1081.5464685160.

Adding to 1265131155 its reverse (5511315621), we get a palindrome (6776446776).

The spelling of 1265131155 in words is "one billion, two hundred sixty-five million, one hundred thirty-one thousand, one hundred fifty-five".