2631509 has 2 divisors, whose sum is σ = 2631510. Its totient is φ = 2631508.

The previous prime is 2631493. The next prime is 2631511. The reversal of 2631509 is 9051362.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2630884 + 625 = 1622^2 + 25^2 .

It is a cyclic number.

It is not a de Polignac number, because 2631509 - 2⁴ = 2631493 is a prime.

It is a super-3 number, since 3×2631509³ = 54668333327715615687, which contains 333 as substring.

Together with 2631511, it forms a pair of twin primes.

It is a Chen prime.

It is an Ulam number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2631529) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1315754 + 1315755.

It is an arithmetic number, because the mean of its divisors is an integer number (1315755).

2^2631509 is an apocalyptic number.

It is an amenable number.

2631509 is a deficient number, since it is larger than the sum of its proper divisors (1).

2631509 is an equidigital number, since it uses as much as digits as its factorization.

2631509 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1620, while the sum is 26.

The square root of 2631509 is about 1622.1926519375. The cubic root of 2631509 is about 138.0601327239.

The spelling of 2631509 in words is "two million, six hundred thirty-one thousand, five hundred nine".