400500555491 has 2 divisors, whose sum is σ = 400500555492. Its totient is φ = 400500555490.

The previous prime is 400500555461. The next prime is 400500555517. The reversal of 400500555491 is 194555005004.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-400500555491 is a prime.

It is not a weakly prime, because it can be changed into another prime (400500555401) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 200250277745 + 200250277746.

It is an arithmetic number, because the mean of its divisors is an integer number (200250277746).

Almost surely, 2^400500555491 is an apocalyptic number.

400500555491 is a deficient number, since it is larger than the sum of its proper divisors (1).

400500555491 is an equidigital number, since it uses as much as digits as its factorization.

400500555491 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 90000, while the sum is 38.

The spelling of 400500555491 in words is "four hundred billion, five hundred million, five hundred fifty-five thousand, four hundred ninety-one".