311542640406 has 48 divisors (see below), whose sum is σ = 717861034800. Its totient is φ = 97367629824.

The previous prime is 311542640389. The next prime is 311542640411. The reversal of 311542640406 is 604046245113.

311542640406 is a `hidden beast` number, since 3 + 1 + 1 + 5 + 4 + 2 + 640 + 4 + 0 + 6 = 666.

It is a super-2 number, since 2×311542640406² (a number of 24 digits) contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 4662411 + ... + 4728758.

It is an arithmetic number, because the mean of its divisors is an integer number (14955438225).

Almost surely, 2^311542640406 is an apocalyptic number.

311542640406 is an abundant number, since it is smaller than the sum of its proper divisors (406318394394).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

311542640406 is a wasteful number, since it uses less digits than its factorization.

311542640406 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9391293 (or 9391290 counting only the distinct ones).

The product of its (nonzero) digits is 69120, while the sum is 36.

Adding to 311542640406 its reverse (604046245113), we get a palindrome (915588885519).

The spelling of 311542640406 in words is "three hundred eleven billion, five hundred forty-two million, six hundred forty thousand, four hundred six".