1961941487 has 4 divisors (see below), whose sum is σ = 2140299816. Its totient is φ = 1783583160.

The previous prime is 1961941483. The next prime is 1961941489. The reversal of 1961941487 is 7841491691.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1961941487 - 2² = 1961941483 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1961941483) 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, 89179148 + ... + 89179169.

It is an arithmetic number, because the mean of its divisors is an integer number (535074954).

Almost surely, 2^1961941487 is an apocalyptic number.

1961941487 is a deficient number, since it is larger than the sum of its proper divisors (178358329).

1961941487 is a wasteful number, since it uses less digits than its factorization.

1961941487 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 178358328.

The product of its digits is 435456, while the sum is 50.

The square root of 1961941487 is about 44293.8086757055. The cubic root of 1961941487 is about 1251.8780275569.

The spelling of 1961941487 in words is "one billion, nine hundred sixty-one million, nine hundred forty-one thousand, four hundred eighty-seven".