51842745 has 24 divisors (see below), whose sum is σ = 91560456. Its totient is φ = 27126528.

The previous prime is 51842731. The next prime is 51842761. The reversal of 51842745 is 54724815.

51842745 = T₁₅₀ + T₁₅₁ + ... + T₆₇₉.

It can be written as a sum of positive squares in 4 ways, for example, as 1375929 + 50466816 = 1173^2 + 7104^2 .

It is not a de Polignac number, because 51842745 - 2⁷ = 51842617 is a prime.

It is a hoax number, since the sum of its digits (36) coincides with the sum of the digits of its distinct prime factors.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 8484 + ... + 13253.

It is an arithmetic number, because the mean of its divisors is an integer number (3815019).

Almost surely, 2^51842745 is an apocalyptic number.

It is an amenable number.

51842745 is a deficient number, since it is larger than the sum of its proper divisors (39717711).

51842745 is a wasteful number, since it uses less digits than its factorization.

51842745 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21801 (or 21798 counting only the distinct ones).

The product of its digits is 44800, while the sum is 36.

The square root of 51842745 is about 7200.1906224766. The cubic root of 51842745 is about 372.8744818894.

The spelling of 51842745 in words is "fifty-one million, eight hundred forty-two thousand, seven hundred forty-five".