1987158629 has 2 divisors, whose sum is σ = 1987158630. Its totient is φ = 1987158628.

The previous prime is 1987158499. The next prime is 1987158703. The reversal of 1987158629 is 9268517891.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1149345604 + 837813025 = 33902^2 + 28945^2 .

It is an emirp because it is prime and its reverse (9268517891) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1987158629 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1987151629) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 993579314 + 993579315.

It is an arithmetic number, because the mean of its divisors is an integer number (993579315).

Almost surely, 2^1987158629 is an apocalyptic number.

It is an amenable number.

1987158629 is a deficient number, since it is larger than the sum of its proper divisors (1).

1987158629 is an equidigital number, since it uses as much as digits as its factorization.

1987158629 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2177280, while the sum is 56.

The square root of 1987158629 is about 44577.5574588828. The cubic root of 1987158629 is about 1257.2187391149.

The spelling of 1987158629 in words is "one billion, nine hundred eighty-seven million, one hundred fifty-eight thousand, six hundred twenty-nine".