51070251 has 4 divisors (see below), whose sum is σ = 68093672. Its totient is φ = 34046832.

The previous prime is 51070231. The next prime is 51070259. The reversal of 51070251 is 15207015.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 51070251 - 2²³ = 42681643 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51070259) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8511706 + ... + 8511711.

It is an arithmetic number, because the mean of its divisors is an integer number (17023418).

Almost surely, 2^51070251 is an apocalyptic number.

51070251 is a deficient number, since it is larger than the sum of its proper divisors (17023421).

51070251 is a wasteful number, since it uses less digits than its factorization.

51070251 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17023420.

The product of its (nonzero) digits is 350, while the sum is 21.

The square root of 51070251 is about 7146.3452897268. The cubic root of 51070251 is about 371.0131739013.

Adding to 51070251 its reverse (15207015), we get a palindrome (66277266).

The spelling of 51070251 in words is "fifty-one million, seventy thousand, two hundred fifty-one".