975240781 has 2 divisors, whose sum is σ = 975240782. Its totient is φ = 975240780.

The previous prime is 975240713. The next prime is 975240793. The reversal of 975240781 is 187042579.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 769174756 + 206066025 = 27734^2 + 14355^2 .

It is an emirp because it is prime and its reverse (187042579) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 975240781 - 2²¹ = 973143629 is a prime.

It is a super-2 number, since 2×975240781² = 1902189161850979922, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (975240281) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 487620390 + 487620391.

It is an arithmetic number, because the mean of its divisors is an integer number (487620391).

Almost surely, 2^975240781 is an apocalyptic number.

It is an amenable number.

975240781 is a deficient number, since it is larger than the sum of its proper divisors (1).

975240781 is an equidigital number, since it uses as much as digits as its factorization.

975240781 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 141120, while the sum is 43.

The square root of 975240781 is about 31228.8453356828. The cubic root of 975240781 is about 991.6778611295.

The spelling of 975240781 in words is "nine hundred seventy-five million, two hundred forty thousand, seven hundred eighty-one".