1261153311 has 16 divisors (see below), whose sum is σ = 1835322240. Its totient is φ = 763953120.

The previous prime is 1261153301. The next prime is 1261153349. The reversal of 1261153311 is 1133511621.

It is not a de Polignac number, because 1261153311 - 2¹¹ = 1261151263 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1261153301) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 66456 + ... + 83298.

It is an arithmetic number, because the mean of its divisors is an integer number (114707640).

Almost surely, 2^1261153311 is an apocalyptic number.

1261153311 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

1261153311 is a deficient number, since it is larger than the sum of its proper divisors (574168929).

1261153311 is a wasteful number, since it uses less digits than its factorization.

1261153311 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19126.

The product of its digits is 540, while the sum is 24.

The square root of 1261153311 is about 35512.7204111428. The cubic root of 1261153311 is about 1080.4117402986.

Adding to 1261153311 its reverse (1133511621), we get a palindrome (2394664932).

The spelling of 1261153311 in words is "one billion, two hundred sixty-one million, one hundred fifty-three thousand, three hundred eleven".