1311608397 has 32 divisors (see below), whose sum is σ = 1961124480. Its totient is φ = 772992000.

The previous prime is 1311608377. The next prime is 1311608407. The reversal of 1311608397 is 7938061131.

1311608397 is digitally balanced in base 4, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 1311608397 - 2¹⁴ = 1311592013 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1311608377) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 175497 + ... + 182817.

It is an arithmetic number, because the mean of its divisors is an integer number (61285140).

Almost surely, 2^1311608397 is an apocalyptic number.

It is an amenable number.

1311608397 is a deficient number, since it is larger than the sum of its proper divisors (649516083).

1311608397 is a wasteful number, since it uses less digits than its factorization.

1311608397 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7485.

The product of its (nonzero) digits is 27216, while the sum is 39.

The square root of 1311608397 is about 36216.1344845084. The cubic root of 1311608397 is about 1094.6318054841.

The spelling of 1311608397 in words is "one billion, three hundred eleven million, six hundred eight thousand, three hundred ninety-seven".