1561867213 has 8 divisors (see below), whose sum is σ = 1577964960. Its totient is φ = 1545801840.

The previous prime is 1561867211. The next prime is 1561867253. The reversal of 1561867213 is 3127681651.

It is a happy number.

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 1561867213 - 2¹ = 1561867211 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 (1561867211) 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, 95658 + ... + 110788.

It is an arithmetic number, because the mean of its divisors is an integer number (197245620).

Almost surely, 2^1561867213 is an apocalyptic number.

It is an amenable number.

1561867213 is a deficient number, since it is larger than the sum of its proper divisors (16097747).

1561867213 is a wasteful number, since it uses less digits than its factorization.

1561867213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16187.

The product of its digits is 60480, while the sum is 40.

The square root of 1561867213 is about 39520.4657487738. The cubic root of 1561867213 is about 1160.2405399413.

The spelling of 1561867213 in words is "one billion, five hundred sixty-one million, eight hundred sixty-seven thousand, two hundred thirteen".