2631553 has 2 divisors, whose sum is σ = 2631554. Its totient is φ = 2631552.

The previous prime is 2631539. The next prime is 2631581. The reversal of 2631553 is 3551362.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1937664 + 693889 = 1392^2 + 833^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2631553 is a prime.

It is an Ulam number.

2631553 is a lucky number.

It is not a weakly prime, because it can be changed into another prime (2631523) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1315776 + 1315777.

It is an arithmetic number, because the mean of its divisors is an integer number (1315777).

2^2631553 is an apocalyptic number.

It is an amenable number.

2631553 is a deficient number, since it is larger than the sum of its proper divisors (1).

2631553 is an equidigital number, since it uses as much as digits as its factorization.

2631553 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2700, while the sum is 25.

The square root of 2631553 is about 1622.2062137718. The cubic root of 2631553 is about 138.0609021952.

The spelling of 2631553 in words is "two million, six hundred thirty-one thousand, five hundred fifty-three".