1139757781 has 2 divisors, whose sum is σ = 1139757782. Its totient is φ = 1139757780.

The previous prime is 1139757767. The next prime is 1139757791. The reversal of 1139757781 is 1877579311.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 583222500 + 556535281 = 24150^2 + 23591^2 .

It is an emirp because it is prime and its reverse (1877579311) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1139757781 - 2⁷ = 1139757653 is a prime.

It is a super-2 number, since 2×1139757781² = 2598095598700087922, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1139757721) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 569878890 + 569878891.

It is an arithmetic number, because the mean of its divisors is an integer number (569878891).

Almost surely, 2^1139757781 is an apocalyptic number.

It is an amenable number.

1139757781 is a deficient number, since it is larger than the sum of its proper divisors (1).

1139757781 is an equidigital number, since it uses as much as digits as its factorization.

1139757781 is an evil number, because the sum of its binary digits is even.

The product of its digits is 370440, while the sum is 49.

The square root of 1139757781 is about 33760.2988878949. The cubic root of 1139757781 is about 1044.5699354392.

The spelling of 1139757781 in words is "one billion, one hundred thirty-nine million, seven hundred fifty-seven thousand, seven hundred eighty-one".