128737513 has 4 divisors (see below), whose sum is σ = 132890368. Its totient is φ = 124584660.

The previous prime is 128737501. The next prime is 128737547. The reversal of 128737513 is 315737821.

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 not a de Polignac number, because 128737513 - 2¹⁷ = 128606441 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (128737573) 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, 2076381 + ... + 2076442.

It is an arithmetic number, because the mean of its divisors is an integer number (33222592).

Almost surely, 2^128737513 is an apocalyptic number.

It is an amenable number.

128737513 is a deficient number, since it is larger than the sum of its proper divisors (4152855).

128737513 is an equidigital number, since it uses as much as digits as its factorization.

128737513 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4152854.

The product of its digits is 35280, while the sum is 37.

The square root of 128737513 is about 11346.2554616049. The cubic root of 128737513 is about 504.9344920419.

The spelling of 128737513 in words is "one hundred twenty-eight million, seven hundred thirty-seven thousand, five hundred thirteen".