2601373781 has 4 divisors (see below), whose sum is σ = 2664821964. Its totient is φ = 2537925600.

The previous prime is 2601373777. The next prime is 2601373787. The reversal of 2601373781 is 1873731062.

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 1093294225 + 1508079556 = 33065^2 + 38834^2 .

It is a cyclic number.

It is not a de Polignac number, because 2601373781 - 2² = 2601373777 is a prime.

It is a super-2 number, since 2×2601373781² = 13534291096948471922, 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 (2601373787) 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, 31724030 + ... + 31724111.

It is an arithmetic number, because the mean of its divisors is an integer number (666205491).

Almost surely, 2^2601373781 is an apocalyptic number.

It is an amenable number.

2601373781 is a deficient number, since it is larger than the sum of its proper divisors (63448183).

2601373781 is an equidigital number, since it uses as much as digits as its factorization.

2601373781 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 63448182.

The product of its (nonzero) digits is 42336, while the sum is 38.

The square root of 2601373781 is about 51003.6643879633. The cubic root of 2601373781 is about 1375.3110094936.

The spelling of 2601373781 in words is "two billion, six hundred one million, three hundred seventy-three thousand, seven hundred eighty-one".