51115245 has 8 divisors (see below), whose sum is σ = 81784416. Its totient is φ = 27261456.

The previous prime is 51115237. The next prime is 51115247. The reversal of 51115245 is 54251115.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 51115245 - 2³ = 51115237 is a prime.

It is a super-2 number, since 2×51115245² = 5225536542820050, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51115247) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1703827 + ... + 1703856.

It is an arithmetic number, because the mean of its divisors is an integer number (10223052).

Almost surely, 2^51115245 is an apocalyptic number.

It is an amenable number.

51115245 is a deficient number, since it is larger than the sum of its proper divisors (30669171).

51115245 is a wasteful number, since it uses less digits than its factorization.

51115245 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3407691.

The product of its digits is 1000, while the sum is 24.

The square root of 51115245 is about 7149.4926393416. The cubic root of 51115245 is about 371.1220988064.

It can be divided in two parts, 51115 and 245, that added together give a triangular number (51360 = T₃₂₀).

The spelling of 51115245 in words is "fifty-one million, one hundred fifteen thousand, two hundred forty-five".