1403606681 has 2 divisors, whose sum is σ = 1403606682. Its totient is φ = 1403606680.

The previous prime is 1403606653. The next prime is 1403606689. The reversal of 1403606681 is 1866063041.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1402128025 + 1478656 = 37445^2 + 1216^2 .

It is a cyclic number.

It is not a de Polignac number, because 1403606681 - 2²⁶ = 1336497817 is a prime.

It is a super-2 number, since 2×1403606681² = 3940223429895671522, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1403606689) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 701803340 + 701803341.

It is an arithmetic number, because the mean of its divisors is an integer number (701803341).

Almost surely, 2^1403606681 is an apocalyptic number.

It is an amenable number.

1403606681 is a deficient number, since it is larger than the sum of its proper divisors (1).

1403606681 is an equidigital number, since it uses as much as digits as its factorization.

1403606681 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 20736, while the sum is 35.

The square root of 1403606681 is about 37464.7391689839. The cubic root of 1403606681 is about 1119.6487740633.

The spelling of 1403606681 in words is "one billion, four hundred three million, six hundred six thousand, six hundred eighty-one".