51172149 has 32 divisors (see below), whose sum is σ = 82554880. Its totient is φ = 27542592.

The previous prime is 51172133. The next prime is 51172249. The reversal of 51172149 is 94127115.

51172149 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 51172149 - 2⁴ = 51172133 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51172249) 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 31 ways as a sum of consecutive naturals, for example, 110292 + ... + 110754.

It is an arithmetic number, because the mean of its divisors is an integer number (2579840).

Almost surely, 2^51172149 is an apocalyptic number.

It is an amenable number.

51172149 is a deficient number, since it is larger than the sum of its proper divisors (31382731).

51172149 is a wasteful number, since it uses less digits than its factorization.

51172149 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 769.

The product of its digits is 2520, while the sum is 30.

The square root of 51172149 is about 7153.4711154795. The cubic root of 51172149 is about 371.2597648465.

The spelling of 51172149 in words is "fifty-one million, one hundred seventy-two thousand, one hundred forty-nine".