1101225645 has 32 divisors (see below), whose sum is σ = 2108332800. Its totient is φ = 542140992.

The previous prime is 1101225607. The next prime is 1101225647. The reversal of 1101225645 is 5465221011.

1101225645 is a `hidden beast` number, since 1 + 1 + 0 + 12 + 2 + 5 + 645 = 666.

It is not a de Polignac number, because 1101225645 - 2⁶ = 1101225581 is a prime.

It is a super-3 number, since 3×1101225645³ (a number of 28 digits) contains 333 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1101225647) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 311985 + ... + 315494.

It is an arithmetic number, because the mean of its divisors is an integer number (65885400).

Almost surely, 2^1101225645 is an apocalyptic number.

1101225645 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1101225645 is a deficient number, since it is larger than the sum of its proper divisors (1007107155).

1101225645 is a wasteful number, since it uses less digits than its factorization.

1101225645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 627506 (or 627500 counting only the distinct ones).

The product of its (nonzero) digits is 2400, while the sum is 27.

The square root of 1101225645 is about 33184.7200530606. The cubic root of 1101225645 is about 1032.6633698032.

Adding to 1101225645 its reverse (5465221011), we get a palindrome (6566446656).

It can be divided in two parts, 1101225 and 645, that added together give a triangular number (1101870 = T₁₄₈₄).

The spelling of 1101225645 in words is "one billion, one hundred one million, two hundred twenty-five thousand, six hundred forty-five".