2131720477 has 4 divisors (see below), whose sum is σ = 2224404000. Its totient is φ = 2039036956.

The previous prime is 2131720469. The next prime is 2131720483. The reversal of 2131720477 is 7740271312.

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.

It is a cyclic number.

It is not a de Polignac number, because 2131720477 - 2³ = 2131720469 is a prime.

It is a super-2 number, since 2×2131720477² = 9088464384122215058, 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 (2131720427) 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, 46341727 + ... + 46341772.

It is an arithmetic number, because the mean of its divisors is an integer number (556101000).

Almost surely, 2^2131720477 is an apocalyptic number.

It is an amenable number.

2131720477 is a deficient number, since it is larger than the sum of its proper divisors (92683523).

2131720477 is an equidigital number, since it uses as much as digits as its factorization.

2131720477 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 92683522.

The product of its (nonzero) digits is 16464, while the sum is 34.

The square root of 2131720477 is about 46170.5585519604. The cubic root of 2131720477 is about 1286.9946819199.

Adding to 2131720477 its reverse (7740271312), we get a palindrome (9871991789).

The spelling of 2131720477 in words is "two billion, one hundred thirty-one million, seven hundred twenty thousand, four hundred seventy-seven".