1561455079 has 2 divisors, whose sum is σ = 1561455080. Its totient is φ = 1561455078.

The previous prime is 1561455059. The next prime is 1561455107. The reversal of 1561455079 is 9705541651.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1561455079 - 2¹⁷ = 1561324007 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1561455059) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 780727539 + 780727540.

It is an arithmetic number, because the mean of its divisors is an integer number (780727540).

Almost surely, 2^1561455079 is an apocalyptic number.

1561455079 is a deficient number, since it is larger than the sum of its proper divisors (1).

1561455079 is an equidigital number, since it uses as much as digits as its factorization.

1561455079 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 189000, while the sum is 43.

The square root of 1561455079 is about 39515.2512202567. The cubic root of 1561455079 is about 1160.1384790585.

The spelling of 1561455079 in words is "one billion, five hundred sixty-one million, four hundred fifty-five thousand, seventy-nine".