1561001013139 has 2 divisors, whose sum is σ = 1561001013140. Its totient is φ = 1561001013138.

The previous prime is 1561001013101. The next prime is 1561001013157. The reversal of 1561001013139 is 9313101001651.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1561001013139 - 2²⁵ = 1560967458707 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1561001013139.

It is not a weakly prime, because it can be changed into another prime (1561001013839) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 780500506569 + 780500506570.

It is an arithmetic number, because the mean of its divisors is an integer number (780500506570).

Almost surely, 2^{1561001013139} is an apocalyptic number.

1561001013139 is a deficient number, since it is larger than the sum of its proper divisors (1).

1561001013139 is an equidigital number, since it uses as much as digits as its factorization.

1561001013139 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2430, while the sum is 31.

The spelling of 1561001013139 in words is "one trillion, five hundred sixty-one billion, one million, thirteen thousand, one hundred thirty-nine".