121561362 has 72 divisors (see below), whose sum is σ = 289048500. Its totient is φ = 36900864.

The previous prime is 121561361. The next prime is 121561367. The reversal of 121561362 is 263165121.

It can be written as a sum of positive squares in 6 ways, for example, as 9603801 + 111957561 = 3099^2 + 10581^2 .

It is not an unprimeable number, because it can be changed into a prime (121561361) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 270514 + ... + 270962.

Almost surely, 2^121561362 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 121561362, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (144524250).

121561362 is an abundant number, since it is smaller than the sum of its proper divisors (167487138).

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

121561362 is a wasteful number, since it uses less digits than its factorization.

121561362 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 572 (or 556 counting only the distinct ones).

The product of its digits is 2160, while the sum is 27.

The square root of 121561362 is about 11025.4869280227. The cubic root of 121561362 is about 495.3724530792.

The spelling of 121561362 in words is "one hundred twenty-one million, five hundred sixty-one thousand, three hundred sixty-two".