780072541 has 2 divisors, whose sum is σ = 780072542. Its totient is φ = 780072540.

The previous prime is 780072539. The next prime is 780072547. The reversal of 780072541 is 145270087.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 712356100 + 67716441 = 26690^2 + 8229^2 .

It is an emirp because it is prime and its reverse (145270087) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 780072541 - 2¹ = 780072539 is a prime.

Together with 780072539, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 780072497 and 780072506.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (780072547) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 390036270 + 390036271.

It is an arithmetic number, because the mean of its divisors is an integer number (390036271).

Almost surely, 2^780072541 is an apocalyptic number.

It is an amenable number.

780072541 is a deficient number, since it is larger than the sum of its proper divisors (1).

780072541 is an equidigital number, since it uses as much as digits as its factorization.

780072541 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 15680, while the sum is 34.

The square root of 780072541 is about 27929.7787495712. The cubic root of 780072541 is about 920.5449437690.

The spelling of 780072541 in words is "seven hundred eighty million, seventy-two thousand, five hundred forty-one".