137257643 has 4 divisors (see below), whose sum is σ = 145331640. Its totient is φ = 129183648.

The previous prime is 137257639. The next prime is 137257649. The reversal of 137257643 is 346752731.

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

It is a cyclic number.

It is not a de Polignac number, because 137257643 - 2² = 137257639 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 137257597 and 137257606.

It is not an unprimeable number, because it can be changed into a prime (137257649) 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, 4036973 + ... + 4037006.

It is an arithmetic number, because the mean of its divisors is an integer number (36332910).

Almost surely, 2^137257643 is an apocalyptic number.

137257643 is a deficient number, since it is larger than the sum of its proper divisors (8073997).

137257643 is an equidigital number, since it uses as much as digits as its factorization.

137257643 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8073996.

The product of its digits is 105840, while the sum is 38.

The square root of 137257643 is about 11715.7007046100. The cubic root of 137257643 is about 515.8366305221.

The spelling of 137257643 in words is "one hundred thirty-seven million, two hundred fifty-seven thousand, six hundred forty-three".