1306423261 has 24 divisors (see below), whose sum is σ = 1619914464. Its totient is φ = 1038558240.

The previous prime is 1306423243. The next prime is 1306423267. The reversal of 1306423261 is 1623246031.

It is not a de Polignac number, because 1306423261 - 2²⁷ = 1172205533 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1306423267) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 38970 + ... + 64276.

It is an arithmetic number, because the mean of its divisors is an integer number (67496436).

Almost surely, 2^1306423261 is an apocalyptic number.

1306423261 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1306423261 is a deficient number, since it is larger than the sum of its proper divisors (313491203).

1306423261 is a wasteful number, since it uses less digits than its factorization.

1306423261 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25369 (or 25350 counting only the distinct ones).

The product of its (nonzero) digits is 5184, while the sum is 28.

The square root of 1306423261 is about 36144.4776003195. The cubic root of 1306423261 is about 1093.1874438392.

Adding to 1306423261 its reverse (1623246031), we get a palindrome (2929669292).

It can be divided in two parts, 130642 and 3261, that added together give a triangular number (133903 = T₅₁₇).

The spelling of 1306423261 in words is "one billion, three hundred six million, four hundred twenty-three thousand, two hundred sixty-one".