1975531729 has 2 divisors, whose sum is σ = 1975531730. Its totient is φ = 1975531728.

The previous prime is 1975531711. The next prime is 1975531763. The reversal of 1975531729 is 9271355791.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 995528704 + 980003025 = 31552^2 + 31305^2 .

It is a cyclic number.

It is not a de Polignac number, because 1975531729 - 2¹¹ = 1975529681 is a prime.

It is a super-2 number, since 2×1975531729² = 7805451224571458882, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1975531769) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 987765864 + 987765865.

It is an arithmetic number, because the mean of its divisors is an integer number (987765865).

Almost surely, 2^1975531729 is an apocalyptic number.

It is an amenable number.

1975531729 is a deficient number, since it is larger than the sum of its proper divisors (1).

1975531729 is an equidigital number, since it uses as much as digits as its factorization.

1975531729 is an evil number, because the sum of its binary digits is even.

The product of its digits is 595350, while the sum is 49.

The square root of 1975531729 is about 44446.9541026154. The cubic root of 1975531729 is about 1254.7619383054.

The spelling of 1975531729 in words is "one billion, nine hundred seventy-five million, five hundred thirty-one thousand, seven hundred twenty-nine".