1081402542 has 64 divisors (see below), whose sum is σ = 2644945920. Its totient is φ = 324777600.

The previous prime is 1081402529. The next prime is 1081402549. The reversal of 1081402542 is 2452041801.

1081402542 is a `hidden beast` number, since 1 + 0 + 81 + 40 + 2 + 542 = 666.

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 (1081402549) 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, 59067 + ... + 75177.

It is an arithmetic number, because the mean of its divisors is an integer number (41327280).

Almost surely, 2^1081402542 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1081402542, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1322472960).

1081402542 is an abundant number, since it is smaller than the sum of its proper divisors (1563543378).

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

1081402542 is a wasteful number, since it uses less digits than its factorization.

1081402542 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16246 (or 16240 counting only the distinct ones).

The product of its (nonzero) digits is 2560, while the sum is 27.

The square root of 1081402542 is about 32884.6855238118. The cubic root of 1081402542 is about 1026.4295079399.

The spelling of 1081402542 in words is "one billion, eighty-one million, four hundred two thousand, five hundred forty-two".