731622131 has 4 divisors (see below), whose sum is σ = 732096000. Its totient is φ = 731148264.

The previous prime is 731622119. The next prime is 731622137. The reversal of 731622131 is 131226137.

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

It is a cyclic number.

It is not a de Polignac number, because 731622131 - 2¹⁸ = 731359987 is a prime.

It is a super-2 number, since 2×731622131² = 1070541885137962322, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 731622131.

It is not an unprimeable number, because it can be changed into a prime (731622137) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 234611 + ... + 237708.

It is an arithmetic number, because the mean of its divisors is an integer number (183024000).

Almost surely, 2^731622131 is an apocalyptic number.

731622131 is a deficient number, since it is larger than the sum of its proper divisors (473869).

731622131 is a wasteful number, since it uses less digits than its factorization.

731622131 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 473868.

The product of its digits is 1512, while the sum is 26.

The square root of 731622131 is about 27048.5143954340. The cubic root of 731622131 is about 901.0777750743.

Adding to 731622131 its reverse (131226137), we get a palindrome (862848268).

The spelling of 731622131 in words is "seven hundred thirty-one million, six hundred twenty-two thousand, one hundred thirty-one".