137993761 has 4 divisors (see below), whose sum is σ = 138485124. Its totient is φ = 137502400.

The previous prime is 137993753. The next prime is 137993771. The reversal of 137993761 is 167399731.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 30747025 + 107246736 = 5545^2 + 10356^2 .

It is a cyclic number.

It is not a de Polignac number, because 137993761 - 2³ = 137993753 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (137993771) 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, 245260 + ... + 245821.

It is an arithmetic number, because the mean of its divisors is an integer number (34621281).

Almost surely, 2^137993761 is an apocalyptic number.

It is an amenable number.

137993761 is a deficient number, since it is larger than the sum of its proper divisors (491363).

137993761 is an equidigital number, since it uses as much as digits as its factorization.

137993761 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 491362.

The product of its digits is 214326, while the sum is 46.

The square root of 137993761 is about 11747.0745719945. The cubic root of 137993761 is about 516.7571374466.

The spelling of 137993761 in words is "one hundred thirty-seven million, nine hundred ninety-three thousand, seven hundred sixty-one".