51002445 has 48 divisors (see below), whose sum is σ = 91308672. Its totient is φ = 24165120.

The previous prime is 51002423. The next prime is 51002449. The reversal of 51002445 is 54420015.

Added to its reverse (54420015) it gives a triangular number (105422460 = T₁₄₅₂₀).

It is not a de Polignac number, because 51002445 - 2⁶ = 51002381 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51002449) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 163840 + ... + 164150.

It is an arithmetic number, because the mean of its divisors is an integer number (1902264).

Almost surely, 2^51002445 is an apocalyptic number.

It is an amenable number.

51002445 is a deficient number, since it is larger than the sum of its proper divisors (40306227).

51002445 is a wasteful number, since it uses less digits than its factorization.

51002445 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 390 (or 361 counting only the distinct ones).

The product of its (nonzero) digits is 800, while the sum is 21.

The square root of 51002445 is about 7141.5996107315. The cubic root of 51002445 is about 370.8489030481.

Adding to 51002445 its reverse (54420015), we get a triangular number (105422460 = T₁₄₅₂₀).

The spelling of 51002445 in words is "fifty-one million, two thousand, four hundred forty-five".