1220713731 has 12 divisors (see below), whose sum is σ = 1810909152. Its totient is φ = 791814096.

The previous prime is 1220713727. The next prime is 1220713759. The reversal of 1220713731 is 1373170221.

1220713731 is a `hidden beast` number, since 1 + 220 + 71 + 373 + 1 = 666.

It is not a de Polignac number, because 1220713731 - 2² = 1220713727 is a prime.

It is a super-2 number, since 2×1220713731² = 2980284026103880722, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1220713695 and 1220713704.

It is not an unprimeable number, because it can be changed into a prime (1220713531) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1832571 + ... + 1833236.

It is an arithmetic number, because the mean of its divisors is an integer number (150909096).

Almost surely, 2^1220713731 is an apocalyptic number.

1220713731 is a deficient number, since it is larger than the sum of its proper divisors (590195421).

1220713731 is a wasteful number, since it uses less digits than its factorization.

1220713731 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3665850 (or 3665847 counting only the distinct ones).

The product of its (nonzero) digits is 1764, while the sum is 27.

The square root of 1220713731 is about 34938.7139288211. The cubic root of 1220713731 is about 1068.7380618755.

Adding to 1220713731 its reverse (1373170221), we get a palindrome (2593883952).

The spelling of 1220713731 in words is "one billion, two hundred twenty million, seven hundred thirteen thousand, seven hundred thirty-one".