1987506149 has 2 divisors, whose sum is σ = 1987506150. Its totient is φ = 1987506148.

The previous prime is 1987506089. The next prime is 1987506151. The reversal of 1987506149 is 9416057891.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1954524100 + 32982049 = 44210^2 + 5743^2 .

It is a cyclic number.

It is not a de Polignac number, because 1987506149 - 2⁸ = 1987505893 is a prime.

Together with 1987506151, it forms a pair of twin primes.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 1987506097 and 1987506106.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1987506049) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 993753074 + 993753075.

It is an arithmetic number, because the mean of its divisors is an integer number (993753075).

Almost surely, 2^1987506149 is an apocalyptic number.

It is an amenable number.

1987506149 is a deficient number, since it is larger than the sum of its proper divisors (1).

1987506149 is an equidigital number, since it uses as much as digits as its factorization.

1987506149 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 544320, while the sum is 50.

The square root of 1987506149 is about 44581.4552140237. The cubic root of 1987506149 is about 1257.2920235159.

The spelling of 1987506149 in words is "one billion, nine hundred eighty-seven million, five hundred six thousand, one hundred forty-nine".