750007981 has 2 divisors, whose sum is σ = 750007982. Its totient is φ = 750007980.

The previous prime is 750007969. The next prime is 750008009. The reversal of 750007981 is 189700057.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 532917225 + 217090756 = 23085^2 + 14734^2 .

It is a cyclic number.

It is not a de Polignac number, because 750007981 - 2²¹ = 747910829 is a prime.

It is a super-2 number, since 2×750007981² = 1125023943127392722, 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 750007981.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (750007961) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 375003990 + 375003991.

It is an arithmetic number, because the mean of its divisors is an integer number (375003991).

Almost surely, 2^750007981 is an apocalyptic number.

It is an amenable number.

750007981 is a deficient number, since it is larger than the sum of its proper divisors (1).

750007981 is an equidigital number, since it uses as much as digits as its factorization.

750007981 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 17640, while the sum is 37.

The square root of 750007981 is about 27386.2735873284. The cubic root of 750007981 is about 908.5635191690.

The spelling of 750007981 in words is "seven hundred fifty million, seven thousand, nine hundred eighty-one".