731402221 has 16 divisors (see below), whose sum is σ = 805229568. Its totient is φ = 658828800.

The previous prime is 731402219. The next prime is 731402249. The reversal of 731402221 is 122204137.

It is a cyclic number.

It is not a de Polignac number, because 731402221 - 2¹ = 731402219 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 731402192 and 731402201.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (731402281) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 707521 + ... + 708553.

It is an arithmetic number, because the mean of its divisors is an integer number (50326848).

Almost surely, 2^731402221 is an apocalyptic number.

It is an amenable number.

731402221 is a deficient number, since it is larger than the sum of its proper divisors (73827347).

731402221 is a wasteful number, since it uses less digits than its factorization.

731402221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1572.

The product of its (nonzero) digits is 672, while the sum is 22.

The square root of 731402221 is about 27044.4489868069. The cubic root of 731402221 is about 900.9874844437.

Adding to 731402221 its reverse (122204137), we get a palindrome (853606358).

The spelling of 731402221 in words is "seven hundred thirty-one million, four hundred two thousand, two hundred twenty-one".