1026138261 has 16 divisors (see below), whose sum is σ = 1432262016. Its totient is φ = 652244736.

The previous prime is 1026138259. The next prime is 1026138271. The reversal of 1026138261 is 1628316201.

It is not a de Polignac number, because 1026138261 - 2¹ = 1026138259 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1026138251) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2160 + ... + 45353.

It is an arithmetic number, because the mean of its divisors is an integer number (89516376).

Almost surely, 2^1026138261 is an apocalyptic number.

It is an amenable number.

1026138261 is a deficient number, since it is larger than the sum of its proper divisors (406123755).

1026138261 is a wasteful number, since it uses less digits than its factorization.

1026138261 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 47852.

The product of its (nonzero) digits is 3456, while the sum is 30.

The square root of 1026138261 is about 32033.3929049047. The cubic root of 1026138261 is about 1008.6379250810.

The spelling of 1026138261 in words is "one billion, twenty-six million, one hundred thirty-eight thousand, two hundred sixty-one".