1951971161631 has 8 divisors (see below), whose sum is σ = 2602890537600. Its totient is φ = 1301182946712.

The previous prime is 1951971161597. The next prime is 1951971161639. The reversal of 1951971161631 is 1361611791591.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1951971161631 - 2¹¹ = 1951971159583 is a prime.

It is a super-2 number, since 2×1951971161631² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1951971161639) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 32755531 + ... + 32815068.

It is an arithmetic number, because the mean of its divisors is an integer number (325361317200).

Almost surely, 2^{1951971161631} is an apocalyptic number.

1951971161631 is a deficient number, since it is larger than the sum of its proper divisors (650919375969).

1951971161631 is an equidigital number, since it uses as much as digits as its factorization.

1951971161631 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 65580525.

The product of its digits is 306180, while the sum is 51.

The spelling of 1951971161631 in words is "one trillion, nine hundred fifty-one billion, nine hundred seventy-one million, one hundred sixty-one thousand, six hundred thirty-one".