1379172781 has 16 divisors (see below), whose sum is σ = 1600844544. Its totient is φ = 1163798784.

The previous prime is 1379172763. The next prime is 1379172793. The reversal of 1379172781 is 1872719731.

It is a cyclic number.

It is not a de Polignac number, because 1379172781 - 2²¹ = 1377075629 is a prime.

It is a super-2 number, since 2×1379172781² = 3804235119702547922, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1379172181) 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, 119205 + ... + 130261.

It is an arithmetic number, because the mean of its divisors is an integer number (100052784).

Almost surely, 2^1379172781 is an apocalyptic number.

It is an amenable number.

1379172781 is a deficient number, since it is larger than the sum of its proper divisors (221671763).

1379172781 is a wasteful number, since it uses less digits than its factorization.

1379172781 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11340.

The product of its digits is 148176, while the sum is 46.

The square root of 1379172781 is about 37137.2155795235. The cubic root of 1379172781 is about 1113.1137798283.

The spelling of 1379172781 in words is "one billion, three hundred seventy-nine million, one hundred seventy-two thousand, seven hundred eighty-one".