3739972561 has 4 divisors (see below), whose sum is σ = 4027662772. Its totient is φ = 3452282352.

The previous prime is 3739972513. The next prime is 3739972567. The reversal of 3739972561 is 1652799373.

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 147768336 + 3592204225 = 12156^2 + 59935^2 .

It is a cyclic number.

It is not a de Polignac number, because 3739972561 - 2¹³ = 3739964369 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 3739972499 and 3739972508.

It is not an unprimeable number, because it can be changed into a prime (3739972567) 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, 143845086 + ... + 143845111.

It is an arithmetic number, because the mean of its divisors is an integer number (1006915693).

Almost surely, 2^3739972561 is an apocalyptic number.

It is an amenable number.

3739972561 is a deficient number, since it is larger than the sum of its proper divisors (287690211).

3739972561 is a wasteful number, since it uses less digits than its factorization.

3739972561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 287690210.

The product of its digits is 2143260, while the sum is 52.

The square root of 3739972561 is about 61155.3150674575. The cubic root of 3739972561 is about 1552.2302353162.

The spelling of 3739972561 in words is "three billion, seven hundred thirty-nine million, nine hundred seventy-two thousand, five hundred sixty-one".