47881861 has 4 divisors (see below), whose sum is σ = 48900672. Its totient is φ = 46863052.

The previous prime is 47881859. The next prime is 47881879. The reversal of 47881861 is 16818874.

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, and also an emirpimes, since its reverse is a distinct semiprime: 16818874 = 2 ⋅8409437.

It is a cyclic number.

It is not a de Polignac number, because 47881861 - 2¹ = 47881859 is a prime.

It is a super-2 number, since 2×47881861² = 4585345225646642, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (47881831) 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, 509335 + ... + 509428.

It is an arithmetic number, because the mean of its divisors is an integer number (12225168).

Almost surely, 2^47881861 is an apocalyptic number.

It is an amenable number.

47881861 is a deficient number, since it is larger than the sum of its proper divisors (1018811).

47881861 is a wasteful number, since it uses less digits than its factorization.

47881861 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1018810.

The product of its digits is 86016, while the sum is 43.

The square root of 47881861 is about 6919.6720298003. The cubic root of 47881861 is about 363.1257169406.

The spelling of 47881861 in words is "forty-seven million, eight hundred eighty-one thousand, eight hundred sixty-one".