1987729131 has 8 divisors (see below), whose sum is σ = 2806205904. Its totient is φ = 1247202560.

The previous prime is 1987729129. The next prime is 1987729147. The reversal of 1987729131 is 1319277891.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1987729131 - 2¹ = 1987729129 is a prime.

It is a super-2 number, since 2×1987729131² = 7902134196452030322, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1987729111) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 19487490 + ... + 19487591.

It is an arithmetic number, because the mean of its divisors is an integer number (350775738).

Almost surely, 2^1987729131 is an apocalyptic number.

1987729131 is a deficient number, since it is larger than the sum of its proper divisors (818476773).

1987729131 is a wasteful number, since it uses less digits than its factorization.

1987729131 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38975101.

The product of its digits is 190512, while the sum is 48.

The square root of 1987729131 is about 44583.9559819449. The cubic root of 1987729131 is about 1257.3390410654.

The spelling of 1987729131 in words is "one billion, nine hundred eighty-seven million, seven hundred twenty-nine thousand, one hundred thirty-one".