51722091 has 8 divisors (see below), whose sum is σ = 76625360. Its totient is φ = 34481376.

The previous prime is 51722089. The next prime is 51722107. The reversal of 51722091 is 19022715.

It is not a de Polignac number, because 51722091 - 2¹ = 51722089 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27), and also a Moran number because the ratio is a prime number: 1915633 = 51722091 / (5 + 1 + 7 + 2 + 2 + 0 + 9 + 1).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51721091) 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, 957790 + ... + 957843.

It is an arithmetic number, because the mean of its divisors is an integer number (9578170).

Almost surely, 2^51722091 is an apocalyptic number.

51722091 is a deficient number, since it is larger than the sum of its proper divisors (24903269).

51722091 is a wasteful number, since it uses less digits than its factorization.

51722091 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1915642 (or 1915636 counting only the distinct ones).

The product of its (nonzero) digits is 1260, while the sum is 27.

The square root of 51722091 is about 7191.8072137676. The cubic root of 51722091 is about 372.5849926924.

The spelling of 51722091 in words is "fifty-one million, seven hundred twenty-two thousand, ninety-one".