781320941 has 2 divisors, whose sum is σ = 781320942. Its totient is φ = 781320940.

The previous prime is 781320937. The next prime is 781320949. The reversal of 781320941 is 149023187.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 684868900 + 96452041 = 26170^2 + 9821^2 .

It is a cyclic number.

It is not a de Polignac number, because 781320941 - 2² = 781320937 is a prime.

It is a super-2 number, since 2×781320941² = 1220924825690250962, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (781320949) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 390660470 + 390660471.

It is an arithmetic number, because the mean of its divisors is an integer number (390660471).

Almost surely, 2^781320941 is an apocalyptic number.

It is an amenable number.

781320941 is a deficient number, since it is larger than the sum of its proper divisors (1).

781320941 is an equidigital number, since it uses as much as digits as its factorization.

781320941 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 12096, while the sum is 35.

The square root of 781320941 is about 27952.1187211274. The cubic root of 781320941 is about 921.0357510301.

The spelling of 781320941 in words is "seven hundred eighty-one million, three hundred twenty thousand, nine hundred forty-one".