2231761901 has 4 divisors (see below), whose sum is σ = 2231878332. Its totient is φ = 2231645472.

The previous prime is 2231761871. The next prime is 2231761919. The reversal of 2231761901 is 1091671322.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 425596900 + 1806165001 = 20630^2 + 42499^2 .

It is a cyclic number.

It is not a de Polignac number, because 2231761901 - 2¹⁰ = 2231760877 is a prime.

It is a super-3 number, since 3×2231761901³ (a number of 29 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2231761991) 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, 21920 + ... + 70313.

It is an arithmetic number, because the mean of its divisors is an integer number (557969583).

Almost surely, 2^2231761901 is an apocalyptic number.

It is an amenable number.

2231761901 is a deficient number, since it is larger than the sum of its proper divisors (116431).

2231761901 is an equidigital number, since it uses as much as digits as its factorization.

2231761901 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 116430.

The product of its (nonzero) digits is 4536, while the sum is 32.

The square root of 2231761901 is about 47241.5272932618. The cubic root of 2231761901 is about 1306.8205436740.

The spelling of 2231761901 in words is "two billion, two hundred thirty-one million, seven hundred sixty-one thousand, nine hundred one".