2631657481 has 2 divisors, whose sum is σ = 2631657482. Its totient is φ = 2631657480.

The previous prime is 2631657473. The next prime is 2631657499. The reversal of 2631657481 is 1847561362.

2631657481 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2266236025 + 365421456 = 47605^2 + 19116^2 .

It is a cyclic number.

It is not a de Polignac number, because 2631657481 - 2³ = 2631657473 is a prime.

It is a super-2 number, since 2×2631657481² = 13851242194606530722, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (2631657421) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1315828740 + 1315828741.

It is an arithmetic number, because the mean of its divisors is an integer number (1315828741).

Almost surely, 2^2631657481 is an apocalyptic number.

It is an amenable number.

2631657481 is a deficient number, since it is larger than the sum of its proper divisors (1).

2631657481 is an equidigital number, since it uses as much as digits as its factorization.

2631657481 is an evil number, because the sum of its binary digits is even.

The product of its digits is 241920, while the sum is 43.

The square root of 2631657481 is about 51299.6830497031. The cubic root of 2631657481 is about 1380.6272932291.

The spelling of 2631657481 in words is "two billion, six hundred thirty-one million, six hundred fifty-seven thousand, four hundred eighty-one".