72431117797 has 2 divisors, whose sum is σ = 72431117798. Its totient is φ = 72431117796.

The previous prime is 72431117777. The next prime is 72431117831. The reversal of 72431117797 is 79771113427.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 70867231681 + 1563886116 = 266209^2 + 39546^2 .

It is a cyclic number.

It is not a de Polignac number, because 72431117797 - 2⁷ = 72431117669 is a prime.

It is a super-3 number, since 3×72431117797³ (a number of 34 digits) contains 333 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 72431117797.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (72431117777) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36215558898 + 36215558899.

It is an arithmetic number, because the mean of its divisors is an integer number (36215558899).

Almost surely, 2^72431117797 is an apocalyptic number.

It is an amenable number.

72431117797 is a deficient number, since it is larger than the sum of its proper divisors (1).

72431117797 is an equidigital number, since it uses as much as digits as its factorization.

72431117797 is an evil number, because the sum of its binary digits is even.

The product of its digits is 518616, while the sum is 49.

The spelling of 72431117797 in words is "seventy-two billion, four hundred thirty-one million, one hundred seventeen thousand, seven hundred ninety-seven".