51949521 has 24 divisors (see below), whose sum is σ = 83422976. Its totient is φ = 30935520.

The previous prime is 51949519. The next prime is 51949537. The reversal of 51949521 is 12594915.

It is not a de Polignac number, because 51949521 - 2¹ = 51949519 is a prime.

It is not an unprimeable number, because it can be changed into a prime (51949511) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 3535 + ... + 10788.

Almost surely, 2^51949521 is an apocalyptic number.

It is an amenable number.

51949521 is a deficient number, since it is larger than the sum of its proper divisors (31473455).

51949521 is a wasteful number, since it uses less digits than its factorization.

51949521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14373 (or 14370 counting only the distinct ones).

The product of its digits is 16200, while the sum is 36.

The square root of 51949521 is about 7207.6016121870. The cubic root of 51949521 is about 373.1302987388.

The spelling of 51949521 in words is "fifty-one million, nine hundred forty-nine thousand, five hundred twenty-one".