2631551161 has 4 divisors (see below), whose sum is σ = 2670828112. Its totient is φ = 2592274212.

The previous prime is 2631551149. The next prime is 2631551173. The reversal of 2631551161 is 1611551362.

It is a happy number.

2631551161 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is an interprime number because it is at equal distance from previous prime (2631551149) and next prime (2631551173).

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2631551161 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2631551861) 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, 19638375 + ... + 19638508.

It is an arithmetic number, because the mean of its divisors is an integer number (667707028).

Almost surely, 2^2631551161 is an apocalyptic number.

It is an amenable number.

2631551161 is a deficient number, since it is larger than the sum of its proper divisors (39276951).

2631551161 is an equidigital number, since it uses as much as digits as its factorization.

2631551161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39276950.

The product of its digits is 5400, while the sum is 31.

The square root of 2631551161 is about 51298.6467755242. The cubic root of 2631551161 is about 1380.6087003497.

The spelling of 2631551161 in words is "two billion, six hundred thirty-one million, five hundred fifty-one thousand, one hundred sixty-one".