8151381 has 64 divisors (see below), whose sum is σ = 15206400. Its totient is φ = 4209408.

The previous prime is 8151379. The next prime is 8151383. The reversal of 8151381 is 1831518.

It is an interprime number because it is at equal distance from previous prime (8151379) and next prime (8151383).

It is not a de Polignac number, because 8151381 - 2¹ = 8151379 is a prime.

It is a super-2 number, since 2×8151381² = 132890024414322, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is an Ulam number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8151383) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 138130 + ... + 138188.

It is an arithmetic number, because the mean of its divisors is an integer number (237600).

Almost surely, 2^8151381 is an apocalyptic number.

8151381 is the 1806-th heptagonal number.

It is an amenable number.

8151381 is a deficient number, since it is larger than the sum of its proper divisors (7055019).

8151381 is a wasteful number, since it uses less digits than its factorization.

8151381 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 135 (or 129 counting only the distinct ones).

The product of its digits is 960, while the sum is 27.

The square root of 8151381 is about 2855.0623460793. The cubic root of 8151381 is about 201.2536339248.

Adding to 8151381 its reverse (1831518), we get a palindrome (9982899).

The spelling of 8151381 in words is "eight million, one hundred fifty-one thousand, three hundred eighty-one".