51193989 has 48 divisors (see below), whose sum is σ = 95207424. Its totient is φ = 25725600.

The previous prime is 51193979. The next prime is 51193991. The reversal of 51193989 is 98939115.

It is not a de Polignac number, because 51193989 - 2⁴ = 51193973 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51193939) 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, 20292 + ... + 22674.

It is an arithmetic number, because the mean of its divisors is an integer number (1983488).

Almost surely, 2^51193989 is an apocalyptic number.

It is an amenable number.

51193989 is a deficient number, since it is larger than the sum of its proper divisors (44013435).

51193989 is a wasteful number, since it uses less digits than its factorization.

51193989 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2438 (or 2435 counting only the distinct ones).

The product of its digits is 87480, while the sum is 45.

The square root of 51193989 is about 7154.9974842763. The cubic root of 51193989 is about 371.3125745628.

The spelling of 51193989 in words is "fifty-one million, one hundred ninety-three thousand, nine hundred eighty-nine".