137948981 has 4 divisors (see below), whose sum is σ = 138333600. Its totient is φ = 137564364.

The previous prime is 137948971. The next prime is 137949011. The reversal of 137948981 is 189849731.

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 137948981 - 2¹⁸ = 137686837 is a prime.

It is a super-2 number, since 2×137948981² = 38059842717876722, 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 (137948971) 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, 191771 + ... + 192488.

It is an arithmetic number, because the mean of its divisors is an integer number (34583400).

Almost surely, 2^137948981 is an apocalyptic number.

It is an amenable number.

137948981 is a deficient number, since it is larger than the sum of its proper divisors (384619).

137948981 is an equidigital number, since it uses as much as digits as its factorization.

137948981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 384618.

The product of its digits is 435456, while the sum is 50.

The square root of 137948981 is about 11745.1684108828. The cubic root of 137948981 is about 516.7012342232.

The spelling of 137948981 in words is "one hundred thirty-seven million, nine hundred forty-eight thousand, nine hundred eighty-one".