722047531 has 2 divisors, whose sum is σ = 722047532. Its totient is φ = 722047530.

The previous prime is 722047523. The next prime is 722047559. The reversal of 722047531 is 135740227.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 722047531 - 2³ = 722047523 is a prime.

It is a super-2 number, since 2×722047531² = 1042705274046391922, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 722047493 and 722047502.

It is not a weakly prime, because it can be changed into another prime (722047031) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 361023765 + 361023766.

It is an arithmetic number, because the mean of its divisors is an integer number (361023766).

Almost surely, 2^722047531 is an apocalyptic number.

722047531 is a deficient number, since it is larger than the sum of its proper divisors (1).

722047531 is an equidigital number, since it uses as much as digits as its factorization.

722047531 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 11760, while the sum is 31.

The square root of 722047531 is about 26870.9421308595. The cubic root of 722047531 is about 897.1297577205.

Adding to 722047531 its reverse (135740227), we get a palindrome (857787758).

The spelling of 722047531 in words is "seven hundred twenty-two million, forty-seven thousand, five hundred thirty-one".