1561145341 has 12 divisors (see below), whose sum is σ = 1830332928. Its totient is φ = 1327582872.

The previous prime is 1561145239. The next prime is 1561145381. The reversal of 1561145341 is 1435411651.

1561145341 = T₄₅₃₅ + T₄₅₃₆ + ... + T₄₆₈₁.

It is a de Polignac number, because none of the positive numbers 2^k-1561145341 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1561145381) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 119211 + ... + 131656.

It is an arithmetic number, because the mean of its divisors is an integer number (152527744).

Almost surely, 2^1561145341 is an apocalyptic number.

It is an amenable number.

1561145341 is a deficient number, since it is larger than the sum of its proper divisors (269187587).

1561145341 is a wasteful number, since it uses less digits than its factorization.

1561145341 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 251008 (or 251001 counting only the distinct ones).

The product of its digits is 7200, while the sum is 31.

The square root of 1561145341 is about 39511.3318049392. The cubic root of 1561145341 is about 1160.0617637050.

Adding to 1561145341 its reverse (1435411651), we get a palindrome (2996556992).

The spelling of 1561145341 in words is "one billion, five hundred sixty-one million, one hundred forty-five thousand, three hundred forty-one".