1311172090 has 16 divisors (see below), whose sum is σ = 2498940072. Its totient is φ = 493617664.

The previous prime is 1311172081. The next prime is 1311172097. The reversal of 1311172090 is 902711131.

It can be written as a sum of positive squares in 4 ways, for example, as 777238641 + 533933449 = 27879^2 + 23107^2 .

It is not an unprimeable number, because it can be changed into a prime (1311172097) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3856219 + ... + 3856558.

Almost surely, 2^1311172090 is an apocalyptic number.

1311172090 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1311172090 is a deficient number, since it is larger than the sum of its proper divisors (1187767982).

1311172090 is a wasteful number, since it uses less digits than its factorization.

1311172090 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7712801.

The product of its (nonzero) digits is 378, while the sum is 25.

The square root of 1311172090 is about 36210.1103284704. The cubic root of 1311172090 is about 1094.5104154697.

The spelling of 1311172090 in words is "one billion, three hundred eleven million, one hundred seventy-two thousand, ninety".