1561141741 has 8 divisors (see below), whose sum is σ = 1635555584. Its totient is φ = 1488231360.

The previous prime is 1561141733. The next prime is 1561141753. The reversal of 1561141741 is 1471411651.

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

It is a cyclic number.

It is not a de Polignac number, because 1561141741 - 2³ = 1561141733 is a prime.

It is a super-2 number, since 2×1561141741² = 4874327070985022162, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (31).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1561121741) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 373740 + ... + 377893.

It is an arithmetic number, because the mean of its divisors is an integer number (204444448).

Almost surely, 2^1561141741 is an apocalyptic number.

It is an amenable number.

1561141741 is a deficient number, since it is larger than the sum of its proper divisors (74413843).

1561141741 is an equidigital number, since it uses as much as digits as its factorization.

1561141741 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 751731.

The product of its digits is 3360, while the sum is 31.

The square root of 1561141741 is about 39511.2862483620. The cubic root of 1561141741 is about 1160.0608720038.

The spelling of 1561141741 in words is "one billion, five hundred sixty-one million, one hundred forty-one thousand, seven hundred forty-one".