1561145354 has 8 divisors (see below), whose sum is σ = 2365859748. Its totient is φ = 772525440.

The previous prime is 1561145239. The next prime is 1561145381. The reversal of 1561145354 is 4535411651.

It can be written as a sum of positive squares in 2 ways, for example, as 1345202329 + 215943025 = 36677^2 + 14695^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4023377 + ... + 4023764.

Almost surely, 2^1561145354 is an apocalyptic number.

1561145354 is a deficient number, since it is larger than the sum of its proper divisors (804714394).

1561145354 is an equidigital number, since it uses as much as digits as its factorization.

1561145354 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8047240.

The product of its digits is 36000, while the sum is 35.

The square root of 1561145354 is about 39511.3319694490. The cubic root of 1561145354 is about 1160.0617669250.

The spelling of 1561145354 in words is "one billion, five hundred sixty-one million, one hundred forty-five thousand, three hundred fifty-four".