1561227367 has 12 divisors (see below), whose sum is σ = 1843231800. Its totient is φ = 1318219056.

The previous prime is 1561227361. The next prime is 1561227377. The reversal of 1561227367 is 7637221651.

It is a de Polignac number, because none of the positive numbers 2^k-1561227367 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 (1561227361) 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, 234492 + ... + 241057.

It is an arithmetic number, because the mean of its divisors is an integer number (153602650).

Almost surely, 2^1561227367 is an apocalyptic number.

1561227367 is a deficient number, since it is larger than the sum of its proper divisors (282004433).

1561227367 is an equidigital number, since it uses as much as digits as its factorization.

1561227367 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 475630 (or 475623 counting only the distinct ones).

The product of its digits is 105840, while the sum is 40.

The square root of 1561227367 is about 39512.3697973179. The cubic root of 1561227367 is about 1160.0820807456.

The spelling of 1561227367 in words is "one billion, five hundred sixty-one million, two hundred twenty-seven thousand, three hundred sixty-seven".