1987151 has 2 divisors, whose sum is σ = 1987152. Its totient is φ = 1987150.

The previous prime is 1987127. The next prime is 1987157. The reversal of 1987151 is 1517891.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1987151 is a prime.

It is an Ulam number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1987157) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 993575 + 993576.

It is an arithmetic number, because the mean of its divisors is an integer number (993576).

2^1987151 is an apocalyptic number.

1987151 is a deficient number, since it is larger than the sum of its proper divisors (1).

1987151 is an equidigital number, since it uses as much as digits as its factorization.

1987151 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2520, while the sum is 32.

The square root of 1987151 is about 1409.6634350085. The cubic root of 1987151 is about 125.7217130229.

The spelling of 1987151 in words is "one million, nine hundred eighty-seven thousand, one hundred fifty-one".