1081956645 has 48 divisors (see below), whose sum is σ = 2338157952. Its totient is φ = 449642880.

The previous prime is 1081956613. The next prime is 1081956661. The reversal of 1081956645 is 5466591801.

1081956645 is a `hidden beast` number, since 1 + 0 + 81 + 9 + 566 + 4 + 5 = 666.

It is not a de Polignac number, because 1081956645 - 2⁵ = 1081956613 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a self number, because there is not a number n which added to its sum of digits gives 1081956645.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 152662 + ... + 159591.

It is an arithmetic number, because the mean of its divisors is an integer number (48711624).

Almost surely, 2^1081956645 is an apocalyptic number.

1081956645 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1081956645 is an abundant number, since it is smaller than the sum of its proper divisors (1256201307).

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

1081956645 is a wasteful number, since it uses less digits than its factorization.

1081956645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 312282 (or 312279 counting only the distinct ones).

The product of its (nonzero) digits is 259200, while the sum is 45.

The square root of 1081956645 is about 32893.1093847936. The cubic root of 1081956645 is about 1026.6047897412.

The spelling of 1081956645 in words is "one billion, eighty-one million, nine hundred fifty-six thousand, six hundred forty-five".