975499781 has 2 divisors, whose sum is σ = 975499782. Its totient is φ = 975499780.

The previous prime is 975499697. The next prime is 975499787. The reversal of 975499781 is 187994579.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 837813025 + 137686756 = 28945^2 + 11734^2 .

It is an emirp because it is prime and its reverse (187994579) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-975499781 is a prime.

It is a super-2 number, since 2×975499781² = 1903199645462095922, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 975499781.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (975499787) 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, 487749890 + 487749891.

It is an arithmetic number, because the mean of its divisors is an integer number (487749891).

Almost surely, 2^975499781 is an apocalyptic number.

It is an amenable number.

975499781 is a deficient number, since it is larger than the sum of its proper divisors (1).

975499781 is an equidigital number, since it uses as much as digits as its factorization.

975499781 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 5715360, while the sum is 59.

The square root of 975499781 is about 31232.9918675749. The cubic root of 975499781 is about 991.7656417874.

The spelling of 975499781 in words is "nine hundred seventy-five million, four hundred ninety-nine thousand, seven hundred eighty-one".