51249319 has 16 divisors (see below), whose sum is σ = 57009024. Its totient is φ = 45684000.

The previous prime is 51249307. The next prime is 51249323. The reversal of 51249319 is 91394215.

It is a cyclic number.

It is not a de Polignac number, because 51249319 - 2⁵ = 51249287 is a prime.

It is a super-2 number, since 2×51249319² = 5252985395927522, 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 (51249349) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 180952 + ... + 181234.

It is an arithmetic number, because the mean of its divisors is an integer number (3563064).

Almost surely, 2^51249319 is an apocalyptic number.

51249319 is a deficient number, since it is larger than the sum of its proper divisors (5759705).

51249319 is a wasteful number, since it uses less digits than its factorization.

51249319 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 558.

The product of its digits is 9720, while the sum is 34.

The square root of 51249319 is about 7158.8629683770. The cubic root of 51249319 is about 371.4462968224.

Subtracting 51249319 from its reverse (91394215), we obtain a square (40144896 = 6336²).

The spelling of 51249319 in words is "fifty-one million, two hundred forty-nine thousand, three hundred nineteen".