51049949 has 4 divisors (see below), whose sum is σ = 53269536. Its totient is φ = 48830364.

The previous prime is 51049937. The next prime is 51049951. The reversal of 51049949 is 94994015.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-51049949 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 (51049909) 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, 1109759 + ... + 1109804.

It is an arithmetic number, because the mean of its divisors is an integer number (13317384).

Almost surely, 2^51049949 is an apocalyptic number.

It is an amenable number.

51049949 is a deficient number, since it is larger than the sum of its proper divisors (2219587).

51049949 is a wasteful number, since it uses less digits than its factorization.

51049949 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2219586.

The product of its (nonzero) digits is 58320, while the sum is 41.

The square root of 51049949 is about 7144.9247021925. The cubic root of 51049949 is about 370.9640043251.

The spelling of 51049949 in words is "fifty-one million, forty-nine thousand, nine hundred forty-nine".