1561455379 has 4 divisors (see below), whose sum is σ = 1703405880. Its totient is φ = 1419504880.

The previous prime is 1561455377. The next prime is 1561455407. The reversal of 1561455379 is 9735541651.

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

It is a cyclic number.

It is not a de Polignac number, because 1561455379 - 2¹ = 1561455377 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1561455373) 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, 70975234 + ... + 70975255.

It is an arithmetic number, because the mean of its divisors is an integer number (425851470).

Almost surely, 2^1561455379 is an apocalyptic number.

1561455379 is a deficient number, since it is larger than the sum of its proper divisors (141950501).

1561455379 is a wasteful number, since it uses less digits than its factorization.

1561455379 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 141950500.

The product of its digits is 567000, while the sum is 46.

The square root of 1561455379 is about 39515.2550162592. The cubic root of 1561455379 is about 1160.1385533570.

The spelling of 1561455379 in words is "one billion, five hundred sixty-one million, four hundred fifty-five thousand, three hundred seventy-nine".