51291345 has 32 divisors (see below), whose sum is σ = 94065408. Its totient is φ = 23378688.

The previous prime is 51291341. The next prime is 51291353. The reversal of 51291345 is 54319215.

It is not a de Polignac number, because 51291345 - 2² = 51291341 is a prime.

It is not an unprimeable number, because it can be changed into a prime (51291341) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 58047 + ... + 58923.

It is an arithmetic number, because the mean of its divisors is an integer number (2939544).

Almost surely, 2^51291345 is an apocalyptic number.

It is an amenable number.

51291345 is a deficient number, since it is larger than the sum of its proper divisors (42774063).

51291345 is a wasteful number, since it uses less digits than its factorization.

51291345 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1449.

The product of its digits is 5400, while the sum is 30.

The square root of 51291345 is about 7161.7976095391. The cubic root of 51291345 is about 371.5478015014.

The spelling of 51291345 in words is "fifty-one million, two hundred ninety-one thousand, three hundred forty-five".