781261201 has 16 divisors (see below), whose sum is σ = 902430720. Its totient is φ = 662513040.

The previous prime is 781261177. The next prime is 781261207. The reversal of 781261201 is 102162187.

It is not a de Polignac number, because 781261201 - 2²⁵ = 747706769 is a prime.

It is a super-2 number, since 2×781261201² = 1220738128375924802, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 781261201.

It is not an unprimeable number, because it can be changed into a prime (781261207) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 382140 + ... + 384178.

It is an arithmetic number, because the mean of its divisors is an integer number (56401920).

Almost surely, 2^781261201 is an apocalyptic number.

It is an amenable number.

781261201 is a deficient number, since it is larger than the sum of its proper divisors (121169519).

781261201 is a wasteful number, since it uses less digits than its factorization.

781261201 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2604.

The product of its (nonzero) digits is 1344, while the sum is 28.

The square root of 781261201 is about 27951.0500876085. The cubic root of 781261201 is about 921.0122762217.

The spelling of 781261201 in words is "seven hundred eighty-one million, two hundred sixty-one thousand, two hundred one".