3761491561 has 3 divisors (see below), whose sum is σ = 3761552893. Its totient is φ = 3761430230.

The previous prime is 3761491523. The next prime is 3761491619. The reversal of 3761491561 is 1651941673.

The square root of 3761491561 is 61331.

It is a perfect power (a square), and thus also a powerful number.

3761491561 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 brilliant number, because the two primes have the same length.

It is not a de Polignac number, because 3761491561 - 2²³ = 3753102953 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (3761491061) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 30666 + ... + 91996.

Almost surely, 2^3761491561 is an apocalyptic number.

3761491561 is the 61331-st square number.

3761491561 is the 30666-th centered octagonal number.

It is an amenable number.

3761491561 is a deficient number, since it is larger than the sum of its proper divisors (61332).

3761491561 is an frugal number, since it uses more digits than its factorization.

3761491561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 122662 (or 61331 counting only the distinct ones).

The product of its digits is 136080, while the sum is 43.

The cubic root of 3761491561 is about 1555.2016103190.

The spelling of 3761491561 in words is "three billion, seven hundred sixty-one million, four hundred ninety-one thousand, five hundred sixty-one".