1205422381 has 4 divisors (see below), whose sum is σ = 1246988700. Its totient is φ = 1163856064.

The previous prime is 1205422373. The next prime is 1205422391. The reversal of 1205422381 is 1832245021.

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

It can be written as a sum of positive squares in 2 ways, for example, as 733055625 + 472366756 = 27075^2 + 21734^2 .

It is a cyclic number.

It is not a de Polignac number, because 1205422381 - 2³ = 1205422373 is a prime.

It is a super-2 number, since 2×1205422381² = 2906086233231418322, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1205422391) 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, 20783116 + ... + 20783173.

It is an arithmetic number, because the mean of its divisors is an integer number (311747175).

Almost surely, 2^1205422381 is an apocalyptic number.

It is an amenable number.

1205422381 is a deficient number, since it is larger than the sum of its proper divisors (41566319).

1205422381 is an equidigital number, since it uses as much as digits as its factorization.

1205422381 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41566318.

The product of its (nonzero) digits is 3840, while the sum is 28.

The square root of 1205422381 is about 34719.1932653972. The cubic root of 1205422381 is about 1064.2567587173.

The spelling of 1205422381 in words is "one billion, two hundred five million, four hundred twenty-two thousand, three hundred eighty-one".