2634000781 has 4 divisors (see below), whose sum is σ = 2634968700. Its totient is φ = 2633032864.

The previous prime is 2634000763. The next prime is 2634000827. The reversal of 2634000781 is 1870004362.

2634000781 = 36290² + 36291².

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1317036681 + 1316964100 = 36291^2 + 36290^2 .

It is a cyclic number.

It is not a de Polignac number, because 2634000781 - 2¹³ = 2633992589 is a prime.

It is a super-2 number, since 2×2634000781² = 13875920228617219922, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2634700781) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 479866 + ... + 485323.

It is an arithmetic number, because the mean of its divisors is an integer number (658742175).

Almost surely, 2^2634000781 is an apocalyptic number.

2634000781 is the 36291-st centered square number.

It is an amenable number.

2634000781 is a deficient number, since it is larger than the sum of its proper divisors (967919).

2634000781 is an equidigital number, since it uses as much as digits as its factorization.

2634000781 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 967918.

The product of its (nonzero) digits is 8064, while the sum is 31.

The square root of 2634000781 is about 51322.5172901720. The cubic root of 2634000781 is about 1381.0369544648.

The spelling of 2634000781 in words is "two billion, six hundred thirty-four million, seven hundred eighty-one", and thus it is an aban number.