3123072731 has 12 divisors (see below), whose sum is σ = 3317150592. Its totient is φ = 2939801904.

The previous prime is 3123072707. The next prime is 3123072739. The reversal of 3123072731 is 1372703213.

It is not a de Polignac number, because 3123072731 - 2¹⁴ = 3123056347 is a prime.

It is a super-2 number, since 2×3123072731² = 19507166566231596722, 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 = 3123072694 and 3123072703.

It is not an unprimeable number, because it can be changed into a prime (3123072739) 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, 29126 + ... + 84228.

It is an arithmetic number, because the mean of its divisors is an integer number (276429216).

Almost surely, 2^3123072731 is an apocalyptic number.

3123072731 is a deficient number, since it is larger than the sum of its proper divisors (194077861).

3123072731 is a wasteful number, since it uses less digits than its factorization.

3123072731 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 55298 (or 55279 counting only the distinct ones).

The product of its (nonzero) digits is 5292, while the sum is 29.

The square root of 3123072731 is about 55884.4587609113. The cubic root of 3123072731 is about 1461.7082542994.

Adding to 3123072731 its reverse (1372703213), we get a palindrome (4495775944).

The spelling of 3123072731 in words is "three billion, one hundred twenty-three million, seventy-two thousand, seven hundred thirty-one".