1072507321 has 2 divisors, whose sum is σ = 1072507322. Its totient is φ = 1072507320.

The previous prime is 1072507297. The next prime is 1072507357. The reversal of 1072507321 is 1237052701.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 570254400 + 502252921 = 23880^2 + 22411^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1072507321 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1072507321.

It is not a weakly prime, because it can be changed into another prime (1072507361) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 536253660 + 536253661.

It is an arithmetic number, because the mean of its divisors is an integer number (536253661).

Almost surely, 2^1072507321 is an apocalyptic number.

It is an amenable number.

1072507321 is a deficient number, since it is larger than the sum of its proper divisors (1).

1072507321 is an equidigital number, since it uses as much as digits as its factorization.

1072507321 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2940, while the sum is 28.

The square root of 1072507321 is about 32749.1575616839. The cubic root of 1072507321 is about 1023.6074115710.

The spelling of 1072507321 in words is "one billion, seventy-two million, five hundred seven thousand, three hundred twenty-one".