51616949 has 4 divisors (see below), whose sum is σ = 51646464. Its totient is φ = 51587436.

The previous prime is 51616937. The next prime is 51616963. The reversal of 51616949 is 94961615.

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-51616949 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 (51616979) 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, 11957 + ... + 15690.

It is an arithmetic number, because the mean of its divisors is an integer number (12911616).

Almost surely, 2^51616949 is an apocalyptic number.

It is an amenable number.

51616949 is a deficient number, since it is larger than the sum of its proper divisors (29515).

51616949 is a wasteful number, since it uses less digits than its factorization.

51616949 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29514.

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

The square root of 51616949 is about 7184.4936495205. The cubic root of 51616949 is about 372.3323546325.

The spelling of 51616949 in words is "fifty-one million, six hundred sixteen thousand, nine hundred forty-nine".