1561340465 has 8 divisors (see below), whose sum is σ = 1873966848. Its totient is φ = 1248833520.

The previous prime is 1561340461. The next prime is 1561340489. The reversal of 1561340465 is 5640431651.

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

It is not a de Polignac number, because 1561340465 - 2² = 1561340461 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1561340461) 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, 1994 + ... + 55916.

It is an arithmetic number, because the mean of its divisors is an integer number (234245856).

Almost surely, 2^1561340465 is an apocalyptic number.

It is an amenable number.

1561340465 is a deficient number, since it is larger than the sum of its proper divisors (312626383).

1561340465 is an equidigital number, since it uses as much as digits as its factorization.

1561340465 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 59719.

The product of its (nonzero) digits is 43200, while the sum is 35.

The square root of 1561340465 is about 39513.8009434678. The cubic root of 1561340465 is about 1160.1100928507.

The spelling of 1561340465 in words is "one billion, five hundred sixty-one million, three hundred forty thousand, four hundred sixty-five".