51249289 has 16 divisors (see below), whose sum is σ = 66398080. Its totient is φ = 38413440.

The previous prime is 51249287. The next prime is 51249307. The reversal of 51249289 is 98294215.

It is not a de Polignac number, because 51249289 - 2¹ = 51249287 is a prime.

It is not an unprimeable number, because it can be changed into a prime (51249281) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 13092 + ... + 16549.

It is an arithmetic number, because the mean of its divisors is an integer number (4149880).

Almost surely, 2^51249289 is an apocalyptic number.

It is an amenable number.

51249289 is a deficient number, since it is larger than the sum of its proper divisors (15148791).

51249289 is a wasteful number, since it uses less digits than its factorization.

51249289 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29680.

The product of its digits is 51840, while the sum is 40.

The square root of 51249289 is about 7158.8608730719. The cubic root of 51249289 is about 371.4462243441.

The spelling of 51249289 in words is "fifty-one million, two hundred forty-nine thousand, two hundred eighty-nine".