128751731 has 2 divisors, whose sum is σ = 128751732. Its totient is φ = 128751730.

The previous prime is 128751719. The next prime is 128751743. The reversal of 128751731 is 137157821.

It is a happy number.

It is a balanced prime because it is at equal distance from previous prime (128751719) and next prime (128751743).

It is an emirp because it is prime and its reverse (137157821) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 128751731 - 2²² = 124557427 is a prime.

It is a super-2 number, since 2×128751731² = 33154016470992722, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 128751691 and 128751700.

It is not a weakly prime, because it can be changed into another prime (128751031) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64375865 + 64375866.

It is an arithmetic number, because the mean of its divisors is an integer number (64375866).

Almost surely, 2^128751731 is an apocalyptic number.

128751731 is a deficient number, since it is larger than the sum of its proper divisors (1).

128751731 is an equidigital number, since it uses as much as digits as its factorization.

128751731 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 11760, while the sum is 35.

The square root of 128751731 is about 11346.8819946274. The cubic root of 128751731 is about 504.9530799789.

The spelling of 128751731 in words is "one hundred twenty-eight million, seven hundred fifty-one thousand, seven hundred thirty-one".