1561014401 has 2 divisors, whose sum is σ = 1561014402. Its totient is φ = 1561014400.

The previous prime is 1561014391. The next prime is 1561014457. The reversal of 1561014401 is 1044101651.

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., 1428764401 + 132250000 = 37799^2 + 11500^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1561014401 is a prime.

It is not a weakly prime, because it can be changed into another prime (1561014101) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 780507200 + 780507201.

It is an arithmetic number, because the mean of its divisors is an integer number (780507201).

Almost surely, 2^1561014401 is an apocalyptic number.

It is an amenable number.

1561014401 is a deficient number, since it is larger than the sum of its proper divisors (1).

1561014401 is an equidigital number, since it uses as much as digits as its factorization.

1561014401 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 480, while the sum is 23.

The square root of 1561014401 is about 39509.6747771986. The cubic root of 1561014401 is about 1160.0293296686.

The spelling of 1561014401 in words is "one billion, five hundred sixty-one million, fourteen thousand, four hundred one".