1631138706 has 24 divisors (see below), whose sum is σ = 3600817740. Its totient is φ = 533453856.

The previous prime is 1631138699. The next prime is 1631138731. The reversal of 1631138706 is 6078311361.

1631138706 is a `hidden beast` number, since 1 + 631 + 13 + 8 + 7 + 0 + 6 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 1468805625 + 162333081 = 38325^2 + 12741^2 .

It is a super-2 number, since 2×1631138706² = 5321226956422708872, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 853941 + ... + 855848.

Almost surely, 2^1631138706 is an apocalyptic number.

1631138706 is an abundant number, since it is smaller than the sum of its proper divisors (1969679034).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1631138706 is a wasteful number, since it uses less digits than its factorization.

1631138706 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1709850 (or 1709847 counting only the distinct ones).

The product of its (nonzero) digits is 18144, while the sum is 36.

The square root of 1631138706 is about 40387.3582448766. The cubic root of 1631138706 is about 1177.1459094611.

The spelling of 1631138706 in words is "one billion, six hundred thirty-one million, one hundred thirty-eight thousand, seven hundred six".