1261369098 has 120 divisors (see below), whose sum is σ = 3131375940.
Its totient is φ = 379209600.
The previous prime is 1261369097. The next prime is 1261369099. The reversal of 1261369098 is 8909631621.
It is a happy number.
It is an interprime number because it is at equal distance from previous prime (1261369097) and next prime (1261369099).
It can be written as a sum of positive squares in 2 ways, for example, as 1113089769 + 148279329 = 33363^2 + 12177^2
It is not an unprimeable number, because it can be changed into a prime (1261369097) by changing a digit.
It is a pernicious number, because its binary representation contains a prime number (17) of ones.
It is a polite number, since it can be written in 59 ways as a sum of consecutive naturals, for example, 4488718 + ... + 4488998.
Almost surely, 21261369098 is an apocalyptic number.
1261369098 is a gapful number since it is divisible by the number (18) formed by its first and last digit.
It is a practical number, because each smaller number is the sum of distinct divisors of 1261369098, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1565687970).
1261369098 is an abundant number, since it is smaller than the sum of its proper divisors (1870006842).
It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.
1261369098 is a wasteful number, since it uses less digits than its factorization.
1261369098 is an odious number, because the sum of its binary digits is odd.
The sum of its prime factors is 546 (or 526 counting only the distinct ones).
The product of its (nonzero) digits is 139968, while the sum is 45.
The square root of 1261369098 is about 35515.7584460757.
The cubic root of 1261369098 is about 1080.4733573149.
The spelling of 1261369098 in words is "one billion, two hundred sixty-one million, three hundred sixty-nine thousand, ninety-eight".