51948013 has 6 divisors (see below), whose sum is σ = 55972014. Its totient is φ = 47928024.

The previous prime is 51948011. The next prime is 51948047. The reversal of 51948013 is 31084915.

It can be written as a sum of positive squares in only one way, i.e., 35964009 + 15984004 = 5997^2 + 3998^2 .

It is not a de Polignac number, because 51948013 - 2¹ = 51948011 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51948011) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 24988 + ... + 26986.

It is an arithmetic number, because the mean of its divisors is an integer number (9328669).

Almost surely, 2^51948013 is an apocalyptic number.

It is an amenable number.

51948013 is a deficient number, since it is larger than the sum of its proper divisors (4024001).

51948013 is an frugal number, since it uses more digits than its factorization.

51948013 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4011 (or 2012 counting only the distinct ones).

The product of its (nonzero) digits is 4320, while the sum is 31.

The square root of 51948013 is about 7207.4969996525. The cubic root of 51948013 is about 373.1266882728.

The spelling of 51948013 in words is "fifty-one million, nine hundred forty-eight thousand, thirteen".