51291961 has 8 divisors (see below), whose sum is σ = 58944704. Its totient is φ = 43720560.

The previous prime is 51291883. The next prime is 51291967. The reversal of 51291961 is 16919215.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 51291961 - 2¹¹ = 51289913 is a prime.

It is not an unprimeable number, because it can be changed into a prime (51291967) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 18975 + ... + 21508.

It is an arithmetic number, because the mean of its divisors is an integer number (7368088).

Almost surely, 2^51291961 is an apocalyptic number.

It is an amenable number.

51291961 is a deficient number, since it is larger than the sum of its proper divisors (7652743).

51291961 is a wasteful number, since it uses less digits than its factorization.

51291961 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40671.

The product of its digits is 4860, while the sum is 34.

The square root of 51291961 is about 7161.8406153726. The cubic root of 51291961 is about 371.5492889033.

The spelling of 51291961 in words is "fifty-one million, two hundred ninety-one thousand, nine hundred sixty-one".