400861194497 has 4 divisors (see below), whose sum is σ = 400955452500. Its totient is φ = 400766936496.

The previous prime is 400861194493. The next prime is 400861194509. The reversal of 400861194497 is 794491168004.

It is a Cunningham number, because it is equal to 633136²+1.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 41291865616 + 359569328881 = 203204^2 + 599641^2 .

It is a cyclic number.

It is not a de Polignac number, because 400861194497 - 2² = 400861194493 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (400861194491) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 47122622 + ... + 47131127.

It is an arithmetic number, because the mean of its divisors is an integer number (100238863125).

Almost surely, 2^400861194497 is an apocalyptic number.

It is an amenable number.

400861194497 is a deficient number, since it is larger than the sum of its proper divisors (94258003).

400861194497 is an equidigital number, since it uses as much as digits as its factorization.

400861194497 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 94258002.

The product of its (nonzero) digits is 1741824, while the sum is 53.

The spelling of 400861194497 in words is "four hundred billion, eight hundred sixty-one million, one hundred ninety-four thousand, four hundred ninety-seven".