3181620381 has 4 divisors (see below), whose sum is σ = 4242160512. Its totient is φ = 2121080252.

The previous prime is 3181620347. The next prime is 3181620391. The reversal of 3181620381 is 1830261813.

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 not a de Polignac number, because 3181620381 - 2⁶ = 3181620317 is a prime.

It is a super-2 number, since 2×3181620381² = 20245416497589170322, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3181620301) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 530270061 + ... + 530270066.

It is an arithmetic number, because the mean of its divisors is an integer number (1060540128).

Almost surely, 2^3181620381 is an apocalyptic number.

It is an amenable number.

3181620381 is a deficient number, since it is larger than the sum of its proper divisors (1060540131).

3181620381 is a wasteful number, since it uses less digits than its factorization.

3181620381 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1060540130.

The product of its (nonzero) digits is 6912, while the sum is 33.

The square root of 3181620381 is about 56405.8541376691. The cubic root of 3181620381 is about 1470.7858850219.

The spelling of 3181620381 in words is "three billion, one hundred eighty-one million, six hundred twenty thousand, three hundred eighty-one".