1298109625621 has 8 divisors (see below), whose sum is σ = 1329814171224. Its totient is φ = 1266407143680.

The previous prime is 1298109625601. The next prime is 1298109625663. The reversal of 1298109625621 is 1265269018921.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 54692838225 + 1243416787396 = 233865^2 + 1115086^2 .

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 1298109625621 - 2²¹ = 1298107528469 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 (1298109625601) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 797871 + ... + 1798003.

It is an arithmetic number, because the mean of its divisors is an integer number (166226771403).

Almost surely, 2^{1298109625621} is an apocalyptic number.

It is an amenable number.

1298109625621 is a deficient number, since it is larger than the sum of its proper divisors (31704545603).

1298109625621 is a wasteful number, since it uses less digits than its factorization.

1298109625621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1031831.

The product of its (nonzero) digits is 933120, while the sum is 52.

The spelling of 1298109625621 in words is "one trillion, two hundred ninety-eight billion, one hundred nine million, six hundred twenty-five thousand, six hundred twenty-one".