1201122381 has 4 divisors (see below), whose sum is σ = 1601496512. Its totient is φ = 800748252.

The previous prime is 1201122367. The next prime is 1201122383. The reversal of 1201122381 is 1832211021.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 1201122381 - 2⁶ = 1201122317 is a prime.

It is a super-2 number, since 2×1201122381² = 2885389948278218322, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1201122383) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 200187061 + ... + 200187066.

It is an arithmetic number, because the mean of its divisors is an integer number (400374128).

Almost surely, 2^1201122381 is an apocalyptic number.

It is an amenable number.

1201122381 is a deficient number, since it is larger than the sum of its proper divisors (400374131).

1201122381 is an equidigital number, since it uses as much as digits as its factorization.

1201122381 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 400374130.

The product of its (nonzero) digits is 192, while the sum is 21.

The square root of 1201122381 is about 34657.2125393835. The cubic root of 1201122381 is about 1062.9897736624.

The spelling of 1201122381 in words is "one billion, two hundred one million, one hundred twenty-two thousand, three hundred eighty-one".