1171990282225 has 27 divisors (see below), whose sum is σ = 1690590843531. Its totient is φ = 803624497200.

The previous prime is 1171990282219. The next prime is 1171990282259. The reversal of 1171990282225 is 5222820991711.

It is a happy number.

The square root of 1171990282225 is 1082585.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 421916501601 + 750073780624 = 649551^2 + 866068^2 .

It is not a de Polignac number, because 1171990282225 - 2⁹ = 1171990281713 is a prime.

It is a super-2 number, since 2×1171990282225² (a number of 25 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (49).

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 37875010 + ... + 37905940.

Almost surely, 2^{1171990282225} is an apocalyptic number.

1171990282225 is the 1082585-th square number.

1171990282225 is the 541293-rd centered octagonal number.

It is an amenable number.

1171990282225 is a deficient number, since it is larger than the sum of its proper divisors (518600561306).

1171990282225 is an frugal number, since it uses more digits than its factorization.

1171990282225 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 61886 (or 30943 counting only the distinct ones).

The product of its (nonzero) digits is 362880, while the sum is 49.

Multiplying 1171990282225 by its sum of digits (49), we get a square (57427523829025 = 7578095²).

1171990282225 divided by its sum of digits (49) gives a square (23918169025 = 154655²).

The spelling of 1171990282225 in words is "one trillion, one hundred seventy-one billion, nine hundred ninety million, two hundred eighty-two thousand, two hundred twenty-five".