1201643381 has 4 divisors (see below), whose sum is σ = 1201829664. Its totient is φ = 1201457100.

The previous prime is 1201643363. The next prime is 1201643389. The reversal of 1201643381 is 1833461021.

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 a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1201643381 is a prime.

It is a super-2 number, since 2×1201643381² = 2887893630202222322, 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 (1201643389) 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, 83105 + ... + 96486.

It is an arithmetic number, because the mean of its divisors is an integer number (300457416).

Almost surely, 2^1201643381 is an apocalyptic number.

It is an amenable number.

1201643381 is a deficient number, since it is larger than the sum of its proper divisors (186283).

1201643381 is an equidigital number, since it uses as much as digits as its factorization.

1201643381 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 186282.

The product of its (nonzero) digits is 3456, while the sum is 29.

The square root of 1201643381 is about 34664.7281974055. The cubic root of 1201643381 is about 1063.1434459346.

The spelling of 1201643381 in words is "one billion, two hundred one million, six hundred forty-three thousand, three hundred eighty-one".