1141631261 has 4 divisors (see below), whose sum is σ = 1141852800. Its totient is φ = 1141409724.

The previous prime is 1141631251. The next prime is 1141631273. The reversal of 1141631261 is 1621361411.

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: 1621361411 = 31 ⋅52301981.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1141631261 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 1141631261.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1141631201) 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, 102851 + ... + 113408.

It is an arithmetic number, because the mean of its divisors is an integer number (285463200).

Almost surely, 2^1141631261 is an apocalyptic number.

It is an amenable number.

1141631261 is a deficient number, since it is larger than the sum of its proper divisors (221539).

1141631261 is an equidigital number, since it uses as much as digits as its factorization.

1141631261 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 221538.

The product of its digits is 864, while the sum is 26.

The square root of 1141631261 is about 33788.0342873035. The cubic root of 1141631261 is about 1045.1419603697.

Adding to 1141631261 its reverse (1621361411), we get a palindrome (2762992672).

The spelling of 1141631261 in words is "one billion, one hundred forty-one million, six hundred thirty-one thousand, two hundred sixty-one".