137784981 has 8 divisors (see below), whose sum is σ = 183826944. Its totient is φ = 91799840.

The previous prime is 137784953. The next prime is 137784989. The reversal of 137784981 is 189487731.

137784981 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 137784981 - 2¹¹ = 137782933 is a prime.

It is a super-2 number, since 2×137784981² = 37969401978340722, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 137784981.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (137784989) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8181 + ... + 18506.

It is an arithmetic number, because the mean of its divisors is an integer number (22978368).

Almost surely, 2^137784981 is an apocalyptic number.

It is an amenable number.

137784981 is a deficient number, since it is larger than the sum of its proper divisors (46041963).

137784981 is a wasteful number, since it uses less digits than its factorization.

137784981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28411.

The product of its digits is 338688, while the sum is 48.

The square root of 137784981 is about 11738.1847404102. The cubic root of 137784981 is about 516.4963937464.

The spelling of 137784981 in words is "one hundred thirty-seven million, seven hundred eighty-four thousand, nine hundred eighty-one".