1561412622 has 128 divisors (see below), whose sum is σ = 4011429888. Its totient is φ = 393465600.

The previous prime is 1561412621. The next prime is 1561412627. The reversal of 1561412622 is 2262141651.

It is a super-2 number, since 2×1561412622² = 4876018752281829768, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 1561412622.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1561412621) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 2259297 + ... + 2259987.

It is an arithmetic number, because the mean of its divisors is an integer number (31339296).

Almost surely, 2^1561412622 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1561412622, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2005714944).

1561412622 is an abundant number, since it is smaller than the sum of its proper divisors (2450017266).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1561412622 is a wasteful number, since it uses less digits than its factorization.

1561412622 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 854.

The product of its digits is 5760, while the sum is 30.

The square root of 1561412622 is about 39514.7139936505. The cubic root of 1561412622 is about 1160.1279639848.

The spelling of 1561412622 in words is "one billion, five hundred sixty-one million, four hundred twelve thousand, six hundred twenty-two".