217401431 has 6 divisors (see below), whose sum is σ = 235411200. Its totient is φ = 200678088.

The previous prime is 217401409. The next prime is 217401463. The reversal of 217401431 is 134104712.

It is a happy number.

It is not a de Polignac number, because 217401431 - 2¹⁸ = 217139287 is a prime.

It is a super-2 number, since 2×217401431² = 94526764401695522, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 217401397 and 217401406.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (217401031) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 643031 + ... + 643368.

It is an arithmetic number, because the mean of its divisors is an integer number (39235200).

Almost surely, 2^217401431 is an apocalyptic number.

217401431 is a deficient number, since it is larger than the sum of its proper divisors (18009769).

217401431 is a wasteful number, since it uses less digits than its factorization.

217401431 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1286425 (or 1286412 counting only the distinct ones).

The product of its (nonzero) digits is 672, while the sum is 23.

The square root of 217401431 is about 14744.5390229739. The cubic root of 217401431 is about 601.2948249999.

The spelling of 217401431 in words is "two hundred seventeen million, four hundred one thousand, four hundred thirty-one".