51391151 has 6 divisors (see below), whose sum is σ = 59781600. Its totient is φ = 44049516.

The previous prime is 51391139. The next prime is 51391199. The reversal of 51391151 is 15119315.

It is not a de Polignac number, because 51391151 - 2¹⁴ = 51374767 is a prime.

It is a super-2 number, since 2×51391151² = 5282100802209602, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 51391151.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51391111) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 524351 + ... + 524448.

It is an arithmetic number, because the mean of its divisors is an integer number (9963600).

Almost surely, 2^51391151 is an apocalyptic number.

51391151 is a deficient number, since it is larger than the sum of its proper divisors (8390449).

51391151 is a wasteful number, since it uses less digits than its factorization.

51391151 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1048813 (or 1048806 counting only the distinct ones).

The product of its digits is 675, while the sum is 26.

The square root of 51391151 is about 7168.7621665110. The cubic root of 51391151 is about 371.7886392308.

The spelling of 51391151 in words is "fifty-one million, three hundred ninety-one thousand, one hundred fifty-one".