1988943461 has 4 divisors (see below), whose sum is σ = 2002115424. Its totient is φ = 1975771500.

The previous prime is 1988943413. The next prime is 1988943521. The reversal of 1988943461 is 1643498891.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 1643498891 = 9173 ⋅179167.

It is a cyclic number.

It is not a de Polignac number, because 1988943461 - 2¹⁴ = 1988927077 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 (1988943961) 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, 6585755 + ... + 6586056.

It is an arithmetic number, because the mean of its divisors is an integer number (500528856).

Almost surely, 2^1988943461 is an apocalyptic number.

It is an amenable number.

1988943461 is a deficient number, since it is larger than the sum of its proper divisors (13171963).

1988943461 is a wasteful number, since it uses less digits than its factorization.

1988943461 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13171962.

The product of its digits is 1492992, while the sum is 53.

The square root of 1988943461 is about 44597.5723666659. The cubic root of 1988943461 is about 1257.5950306232.

The spelling of 1988943461 in words is "one billion, nine hundred eighty-eight million, nine hundred forty-three thousand, four hundred sixty-one".