311621442 has 32 divisors (see below), whose sum is σ = 680914944. Its totient is φ = 94290000.

The previous prime is 311621419. The next prime is 311621447. The reversal of 311621442 is 244126113.

It is a super-2 number, since 2×311621442² = 194215846228318728, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (311621447) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 46423 + ... + 52709.

It is an arithmetic number, because the mean of its divisors is an integer number (21278592).

Almost surely, 2^311621442 is an apocalyptic number.

311621442 is an abundant number, since it is smaller than the sum of its proper divisors (369293502).

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

311621442 is a wasteful number, since it uses less digits than its factorization.

311621442 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7054.

The product of its digits is 1152, while the sum is 24.

The square root of 311621442 is about 17652.8026669988. The cubic root of 311621442 is about 677.9678677091.

Adding to 311621442 its reverse (244126113), we get a palindrome (555747555).

It can be divided in two parts, 3116214 and 42, that added together give a triangular number (3116256 = T₂₄₉₆).

The spelling of 311621442 in words is "three hundred eleven million, six hundred twenty-one thousand, four hundred forty-two".