1081405251 has 12 divisors (see below), whose sum is σ = 1563872128. Its totient is φ = 720086544.

The previous prime is 1081405243. The next prime is 1081405307. The reversal of 1081405251 is 1525041801.

1081405251 is a `hidden beast` number, since 1 + 0 + 8 + 1 + 405 + 251 = 666.

It is not a de Polignac number, because 1081405251 - 2³ = 1081405243 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1081405201) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 62755 + ... + 78108.

Almost surely, 2^1081405251 is an apocalyptic number.

1081405251 is a deficient number, since it is larger than the sum of its proper divisors (482466877).

1081405251 is a wasteful number, since it uses less digits than its factorization.

1081405251 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 141722 (or 141719 counting only the distinct ones).

The product of its (nonzero) digits is 1600, while the sum is 27.

The square root of 1081405251 is about 32884.7267131719. The cubic root of 1081405251 is about 1026.4303650352.

The spelling of 1081405251 in words is "one billion, eighty-one million, four hundred five thousand, two hundred fifty-one".