47122861 has 4 divisors (see below), whose sum is σ = 49894812. Its totient is φ = 44350912.

The previous prime is 47122849. The next prime is 47122871. The reversal of 47122861 is 16822174.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 31866025 + 15256836 = 5645^2 + 3906^2 .

It is a cyclic number.

It is not a de Polignac number, because 47122861 - 2¹⁵ = 47090093 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 (47122871) 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, 1385950 + ... + 1385983.

It is an arithmetic number, because the mean of its divisors is an integer number (12473703).

Almost surely, 2^47122861 is an apocalyptic number.

It is an amenable number.

47122861 is a deficient number, since it is larger than the sum of its proper divisors (2771951).

47122861 is a wasteful number, since it uses less digits than its factorization.

47122861 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2771950.

The product of its digits is 5376, while the sum is 31.

The square root of 47122861 is about 6864.6093115341. The cubic root of 47122861 is about 361.1967911319.

It can be divided in two parts, 471 and 22861, that added together give a palindrome (23332).

The spelling of 47122861 in words is "forty-seven million, one hundred twenty-two thousand, eight hundred sixty-one".