137847961 has 4 divisors (see below), whose sum is σ = 139269172. Its totient is φ = 136426752.

The previous prime is 137847953. The next prime is 137847973. The reversal of 137847961 is 169748731.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 169748731 = 1223 ⋅138797.

It can be written as a sum of positive squares in 2 ways, for example, as 48734361 + 89113600 = 6981^2 + 9440^2 .

It is a cyclic number.

It is not a de Polignac number, because 137847961 - 2³ = 137847953 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (137847911) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 710460 + ... + 710653.

It is an arithmetic number, because the mean of its divisors is an integer number (34817293).

Almost surely, 2^137847961 is an apocalyptic number.

It is an amenable number.

137847961 is a deficient number, since it is larger than the sum of its proper divisors (1421211).

137847961 is an equidigital number, since it uses as much as digits as its factorization.

137847961 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1421210.

The product of its digits is 254016, while the sum is 46.

The square root of 137847961 is about 11740.8671315197. The cubic root of 137847961 is about 516.5750767003.

The spelling of 137847961 in words is "one hundred thirty-seven million, eight hundred forty-seven thousand, nine hundred sixty-one".