1001398877 has 2 divisors, whose sum is σ = 1001398878. Its totient is φ = 1001398876.

The previous prime is 1001398861. The next prime is 1001398939. The reversal of 1001398877 is 7788931001.

1001398877 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 611770756 + 389628121 = 24734^2 + 19739^2 .

It is an emirp because it is prime and its reverse (7788931001) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1001398877 - 2⁴ = 1001398861 is a prime.

It is a super-2 number, since 2×1001398877² = 2005599421713722258, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1001398847) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 500699438 + 500699439.

It is an arithmetic number, because the mean of its divisors is an integer number (500699439).

Almost surely, 2^1001398877 is an apocalyptic number.

It is an amenable number.

1001398877 is a deficient number, since it is larger than the sum of its proper divisors (1).

1001398877 is an equidigital number, since it uses as much as digits as its factorization.

1001398877 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 84672, while the sum is 44.

The square root of 1001398877 is about 31644.8870593655. The cubic root of 1001398877 is about 1000.4660750736.

The spelling of 1001398877 in words is "one billion, one million, three hundred ninety-eight thousand, eight hundred seventy-seven".