379543781 has 2 divisors, whose sum is σ = 379543782. Its totient is φ = 379543780.

The previous prime is 379543763. The next prime is 379543807. The reversal of 379543781 is 187345973.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 249355681 + 130188100 = 15791^2 + 11410^2 .

It is an emirp because it is prime and its reverse (187345973) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-379543781 is a prime.

It is a super-2 number, since 2×379543781² = 288106963391551922, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (379543721) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 189771890 + 189771891.

It is an arithmetic number, because the mean of its divisors is an integer number (189771891).

Almost surely, 2^379543781 is an apocalyptic number.

It is an amenable number.

379543781 is a deficient number, since it is larger than the sum of its proper divisors (1).

379543781 is an equidigital number, since it uses as much as digits as its factorization.

379543781 is an evil number, because the sum of its binary digits is even.

The product of its digits is 635040, while the sum is 47.

The square root of 379543781 is about 19481.8834048456. The cubic root of 379543781 is about 724.0256628623.

The spelling of 379543781 in words is "three hundred seventy-nine million, five hundred forty-three thousand, seven hundred eighty-one".