1087245781 has 2 divisors, whose sum is σ = 1087245782. Its totient is φ = 1087245780.

The previous prime is 1087245701. The next prime is 1087245787. The reversal of 1087245781 is 1875427801.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1049176881 + 38068900 = 32391^2 + 6170^2 .

It is a cyclic number.

It is not a de Polignac number, because 1087245781 - 2¹¹ = 1087243733 is a prime.

It is a super-2 number, since 2×1087245781² = 2364206776604599922, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1087245787) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 543622890 + 543622891.

It is an arithmetic number, because the mean of its divisors is an integer number (543622891).

Almost surely, 2^1087245781 is an apocalyptic number.

It is an amenable number.

1087245781 is a deficient number, since it is larger than the sum of its proper divisors (1).

1087245781 is an equidigital number, since it uses as much as digits as its factorization.

1087245781 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 125440, while the sum is 43.

The square root of 1087245781 is about 32973.4102118662. The cubic root of 1087245781 is about 1028.2749208561.

The spelling of 1087245781 in words is "one billion, eighty-seven million, two hundred forty-five thousand, seven hundred eighty-one".