1561351679 has 8 divisors (see below), whose sum is σ = 1565393520. Its totient is φ = 1557316800.

The previous prime is 1561351661. The next prime is 1561351717. The reversal of 1561351679 is 9761531651.

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 1561351679 - 2²⁸ = 1292916223 is a prime.

It is a super-2 number, since 2×1561351679² = 4875638131032238082, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1561351879) 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, 1321469 + ... + 1322649.

It is an arithmetic number, because the mean of its divisors is an integer number (195674190).

Almost surely, 2^1561351679 is an apocalyptic number.

1561351679 is a deficient number, since it is larger than the sum of its proper divisors (4041841).

1561351679 is a wasteful number, since it uses less digits than its factorization.

1561351679 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3481.

The product of its digits is 170100, while the sum is 44.

The square root of 1561351679 is about 39513.9428430016. The cubic root of 1561351679 is about 1160.1128702597.

The spelling of 1561351679 in words is "one billion, five hundred sixty-one million, three hundred fifty-one thousand, six hundred seventy-nine".