1139261 has 4 divisors (see below), whose sum is σ = 1142400. Its totient is φ = 1136124.

The previous prime is 1139249. The next prime is 1139263. The reversal of 1139261 is 1629311.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 1629311 = 601 ⋅2711.

It is a cyclic number.

It is not a de Polignac number, because 1139261 - 2⁶ = 1139197 is a prime.

It is a super-2 number, since 2×1139261² = 2595831252242, 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 (1139263) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 941 + ... + 1778.

It is an arithmetic number, because the mean of its divisors is an integer number (285600).

2^1139261 is an apocalyptic number.

It is an amenable number.

1139261 is a deficient number, since it is larger than the sum of its proper divisors (3139).

1139261 is an equidigital number, since it uses as much as digits as its factorization.

1139261 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3138.

The product of its digits is 324, while the sum is 23.

The square root of 1139261 is about 1067.3617006432. The cubic root of 1139261 is about 104.4418149414.

The spelling of 1139261 in words is "one million, one hundred thirty-nine thousand, two hundred sixty-one".