2131551 has 12 divisors (see below), whose sum is σ = 3099928. Its totient is φ = 1411344.

The previous prime is 2131541. The next prime is 2131559. The reversal of 2131551 is 1551312.

It is not a de Polignac number, because 2131551 - 2⁹ = 2131039 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2131559) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 741 + ... + 2193.

2^2131551 is an apocalyptic number.

2131551 is a deficient number, since it is larger than the sum of its proper divisors (968377).

2131551 is a wasteful number, since it uses less digits than its factorization.

2131551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1622 (or 1619 counting only the distinct ones).

The product of its digits is 150, while the sum is 18.

The square root of 2131551 is about 1459.9832190816. The cubic root of 2131551 is about 128.6960574606.

Adding to 2131551 its reverse (1551312), we get a palindrome (3682863).

It can be divided in two parts, 213 and 1551, that added together give a square (1764 = 42²).

The spelling of 2131551 in words is "two million, one hundred thirty-one thousand, five hundred fifty-one".