780975551 has 2 divisors, whose sum is σ = 780975552. Its totient is φ = 780975550.

The previous prime is 780975541. The next prime is 780975661. The reversal of 780975551 is 155579087.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-780975551 is a prime.

It is a super-2 number, since 2×780975551² = 1219845622519507202, which contains 22 as substring.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 780975496 and 780975505.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (780975541) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 390487775 + 390487776.

It is an arithmetic number, because the mean of its divisors is an integer number (390487776).

Almost surely, 2^780975551 is an apocalyptic number.

780975551 is a deficient number, since it is larger than the sum of its proper divisors (1).

780975551 is an equidigital number, since it uses as much as digits as its factorization.

780975551 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 441000, while the sum is 47.

The square root of 780975551 is about 27945.9397945390. The cubic root of 780975551 is about 920.9000136276.

The spelling of 780975551 in words is "seven hundred eighty million, nine hundred seventy-five thousand, five hundred fifty-one".