1987157083 has 2 divisors, whose sum is σ = 1987157084. Its totient is φ = 1987157082.

The previous prime is 1987156999. The next prime is 1987157129. The reversal of 1987157083 is 3807517891.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1987157083 is a prime.

It is not a weakly prime, because it can be changed into another prime (1987157383) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 993578541 + 993578542.

It is an arithmetic number, because the mean of its divisors is an integer number (993578542).

Almost surely, 2^1987157083 is an apocalyptic number.

1987157083 is a deficient number, since it is larger than the sum of its proper divisors (1).

1987157083 is an equidigital number, since it uses as much as digits as its factorization.

1987157083 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 423360, while the sum is 49.

The square root of 1987157083 is about 44577.5401183152. The cubic root of 1987157083 is about 1257.2184130781.

The spelling of 1987157083 in words is "one billion, nine hundred eighty-seven million, one hundred fifty-seven thousand, eighty-three".