73981381 has 4 divisors (see below), whose sum is σ = 74141632. Its totient is φ = 73821132.

The previous prime is 73981379. The next prime is 73981403. The reversal of 73981381 is 18318937.

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 73981381 - 2¹ = 73981379 is a prime.

It is a super-2 number, since 2×73981381² = 10946489469334322, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (73981301) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 79431 + ... + 80356.

It is an arithmetic number, because the mean of its divisors is an integer number (18535408).

Almost surely, 2^73981381 is an apocalyptic number.

It is an amenable number.

73981381 is a deficient number, since it is larger than the sum of its proper divisors (160251).

73981381 is a wasteful number, since it uses less digits than its factorization.

73981381 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 160250.

The product of its digits is 36288, while the sum is 40.

The square root of 73981381 is about 8601.2429915681. The cubic root of 73981381 is about 419.7984312442.

The spelling of 73981381 in words is "seventy-three million, nine hundred eighty-one thousand, three hundred eighty-one".