1205427331 has 4 divisors (see below), whose sum is σ = 1210471200. Its totient is φ = 1200383464.

The previous prime is 1205427287. The next prime is 1205427359. The reversal of 1205427331 is 1337245021.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1205427331 - 2¹³ = 1205419139 is a prime.

It is a super-2 number, since 2×1205427331² = 2906110100643567122, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1205427331.

It is not an unprimeable number, because it can be changed into a prime (1205427361) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2521576 + ... + 2522053.

It is an arithmetic number, because the mean of its divisors is an integer number (302617800).

Almost surely, 2^1205427331 is an apocalyptic number.

1205427331 is a deficient number, since it is larger than the sum of its proper divisors (5043869).

1205427331 is an equidigital number, since it uses as much as digits as its factorization.

1205427331 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5043868.

The product of its (nonzero) digits is 5040, while the sum is 28.

The square root of 1205427331 is about 34719.2645515426. The cubic root of 1205427331 is about 1064.2582154857.

The spelling of 1205427331 in words is "one billion, two hundred five million, four hundred twenty-seven thousand, three hundred thirty-one".