128472031 has 4 divisors (see below), whose sum is σ = 130389592. Its totient is φ = 126554472.

The previous prime is 128472007. The next prime is 128472067. The reversal of 128472031 is 130274821.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 130274821 = 43 ⋅3029647.

It is a cyclic number.

It is not a de Polignac number, because 128472031 - 2¹⁷ = 128340959 is a prime.

It is a super-2 number, since 2×128472031² = 33010125498529922, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128472431) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 958680 + ... + 958813.

It is an arithmetic number, because the mean of its divisors is an integer number (32597398).

Almost surely, 2^128472031 is an apocalyptic number.

128472031 is a deficient number, since it is larger than the sum of its proper divisors (1917561).

128472031 is an equidigital number, since it uses as much as digits as its factorization.

128472031 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1917560.

The product of its (nonzero) digits is 2688, while the sum is 28.

The square root of 128472031 is about 11334.5503219140. The cubic root of 128472031 is about 504.5871618610.

It can be divided in two parts, 12847 and 2031, that added together give a triangular number (14878 = T₁₇₂).

The spelling of 128472031 in words is "one hundred twenty-eight million, four hundred seventy-two thousand, thirty-one".