1213731 has 8 divisors (see below), whose sum is σ = 1798160. Its totient is φ = 809136.

The previous prime is 1213721. The next prime is 1213741. The reversal of 1213731 is 1373121.

It is an interprime number because it is at equal distance from previous prime (1213721) and next prime (1213741).

It is not a de Polignac number, because 1213731 - 2¹³ = 1205539 is a prime.

It is a super-2 number, since 2×1213731² = 2946285880722, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1213721) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 22450 + ... + 22503.

It is an arithmetic number, because the mean of its divisors is an integer number (224770).

2^1213731 is an apocalyptic number.

1213731 is a deficient number, since it is larger than the sum of its proper divisors (584429).

1213731 is an equidigital number, since it uses as much as digits as its factorization.

1213731 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 44962 (or 44956 counting only the distinct ones).

The product of its digits is 126, while the sum is 18.

The square root of 1213731 is about 1101.6946037809. The cubic root of 1213731 is about 106.6696364191.

Adding to 1213731 its reverse (1373121), we get a palindrome (2586852).

The spelling of 1213731 in words is "one million, two hundred thirteen thousand, seven hundred thirty-one".