31418861 has 4 divisors (see below), whose sum is σ = 32502300. Its totient is φ = 30335424.

The previous prime is 31418831. The next prime is 31418867. The reversal of 31418861 is 16881413.

It is a happy number.

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 14485636 + 16933225 = 3806^2 + 4115^2 .

It is a cyclic number.

It is not a de Polignac number, because 31418861 - 2¹⁴ = 31402477 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 (31418867) 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, 541676 + ... + 541733.

It is an arithmetic number, because the mean of its divisors is an integer number (8125575).

Almost surely, 2^31418861 is an apocalyptic number.

It is an amenable number.

31418861 is a deficient number, since it is larger than the sum of its proper divisors (1083439).

31418861 is a wasteful number, since it uses less digits than its factorization.

31418861 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1083438.

The product of its digits is 4608, while the sum is 32.

The square root of 31418861 is about 5605.2529826940. The cubic root of 31418861 is about 315.5465810604.

The spelling of 31418861 in words is "thirty-one million, four hundred eighteen thousand, eight hundred sixty-one".