781372051 has 2 divisors, whose sum is σ = 781372052. Its totient is φ = 781372050.

The previous prime is 781371991. The next prime is 781372063. The reversal of 781372051 is 150273187.

781372051 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is an emirp because it is prime and its reverse (150273187) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 781372051 - 2¹⁷ = 781240979 is a prime.

It is a super-2 number, since 2×781372051² = 1221084564167893202, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 781371998 and 781372016.

It is not a weakly prime, because it can be changed into another prime (781372351) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 390686025 + 390686026.

It is an arithmetic number, because the mean of its divisors is an integer number (390686026).

Almost surely, 2^781372051 is an apocalyptic number.

781372051 is a deficient number, since it is larger than the sum of its proper divisors (1).

781372051 is an equidigital number, since it uses as much as digits as its factorization.

781372051 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 11760, while the sum is 34.

The square root of 781372051 is about 27953.0329481436. The cubic root of 781372051 is about 921.0558337337.

The spelling of 781372051 in words is "seven hundred eighty-one million, three hundred seventy-two thousand, fifty-one".