381072511 has 4 divisors (see below), whose sum is σ = 381215992. Its totient is φ = 380929032.

The previous prime is 381072481. The next prime is 381072547. The reversal of 381072511 is 115270183.

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

It is a cyclic number.

It is not a de Polignac number, because 381072511 - 2¹³ = 381064319 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 381072511.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (381022511) 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, 67680 + ... + 73093.

It is an arithmetic number, because the mean of its divisors is an integer number (95303998).

Almost surely, 2^381072511 is an apocalyptic number.

381072511 is the 11271-st hex number.

381072511 is a deficient number, since it is larger than the sum of its proper divisors (143481).

381072511 is a wasteful number, since it uses less digits than its factorization.

381072511 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 143480.

The product of its (nonzero) digits is 1680, while the sum is 28.

The square root of 381072511 is about 19521.0786331084. The cubic root of 381072511 is about 724.9964397764.

The spelling of 381072511 in words is "three hundred eighty-one million, seventy-two thousand, five hundred eleven".