152781381 has 24 divisors (see below), whose sum is σ = 223641600. Its totient is φ = 100499616.

The previous prime is 152781379. The next prime is 152781383. The reversal of 152781381 is 183187251.

152781381 is a `hidden beast` number, since 1 + 5 + 278 + 1 + 381 = 666.

It is an interprime number because it is at equal distance from previous prime (152781379) and next prime (152781383).

It is not a de Polignac number, because 152781381 - 2¹ = 152781379 is a prime.

It is a super-2 number, since 2×152781381² = 46684300760534322, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (152781383) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 398716 + ... + 399098.

It is an arithmetic number, because the mean of its divisors is an integer number (9318400).

Almost surely, 2^152781381 is an apocalyptic number.

It is an amenable number.

152781381 is a deficient number, since it is larger than the sum of its proper divisors (70860219).

152781381 is a wasteful number, since it uses less digits than its factorization.

152781381 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 865 (or 862 counting only the distinct ones).

The product of its digits is 13440, while the sum is 36.

The square root of 152781381 is about 12360.4765684823. The cubic root of 152781381 is about 534.5932576786.

The spelling of 152781381 in words is "one hundred fifty-two million, seven hundred eighty-one thousand, three hundred eighty-one".